I have a 65 coup I drive on the weekends. It sure doesn't handle or brake like my 04 GT. Thinking of upgrading one these and am looking for input from anyone who has used any of these products. I'm considering a kit from Mustang Plus (springs,shocke,sway bar). Any input on weather to go with the 620 or GT front springs and 4 leaf standard or 5 leaf mid-eye rear spring. Or should I go brakes frist? Looking at SSBC or Power Master manual front disc kits. Any reason for price differance? Are these complete kits? Is this a project (the brakes) I can due on the weekend at home or are special tools and expertise needed? Anyone who has done these upgrades your opinions/thoughs would be apprecitated.  

Both are nice to have, but only one is a real necessity! A new suspension won't do a bit of good if you hit someone or something because the car wouldn't stop!!!
It's absolutely critical to have good brakes! Your life and the lives of those in your car are depending on those brakes---Get the discs, FAST!
As for the different springs, I have no idea, but regarding the disc brakes, there are lots of "kits" on the market at all different prices. Some require you to get some or almost all the parts yourself, some require you to change the spindles, some are almost complete, but the one constant is that there will ALWAYS be something you'll need to get yourself, the trick is to be knowledgeable and experienced enough to know what is needed and where to go to get it. Most will need some plumbing of brake lines to make the swap, if you're not experienced in bending and fitting brake lines, you're in for a steep learning curve!
My advice is if you're a shade tree mechanic with little or no experience in brakes, have it done by a Pro. I've done quite a few brake jobs over the years, both drum and disc, but when I converted to front discs on my 67 F/B I thought it was a bit much for my experience level. I had it done by a mechanic I knew was experienced in brakes. At the end of the project I was DEFINITELY glad I did. Experience is necessary!!
Hope that helps,
Jay67fast  

I agree with Jay.
Brake first then modify all else next.  

I disagree.  My 65 has had shoe brakes on it for 43 years and it stops just fine.  And back during the 60's and 70's there were millions of these cars driving on our highways with shoe brakes. For handling purposes, I would get the new springs on now.  The 620's up front and the 4 leaf standard on back.  Also, put new KYB shocks on all four corners.  Put on an export brace and a Montecarlo bar.  These items will make all the difference in the world as far as handling. Then when you get your piggy bank full again, get a disk brake kit.  If you are good with your hands and like to make things work, then go to the junk yard and pull the brakes off of a 1977-84 Ford Granada or a Mercury Monarch and refurbish it with parts you get from AutoZone.  If not, then get all new parts at Autozone.  That will cost you less than buying the SSB kit.  The brakes and spring projects are doable on a weekend if you are pretty good with tools and figuring out things
Here is an article that will help with the brake swap.  Just copy and paste this in a search engine.  
http://www.vintage-mustang.com/topics/faq/drumtodisk.html  

I'm onboard with soaring here.  We drove cars with drum brakes for decades. Yes, disks are better so you're right to have them in consideration.  Having a solid suspension improves the safety of the car and to me that's paramount. If funds allow, you should do both together.  

Thanks for the input.I've been leaning towards the suspension myself. I don't drive the 65 in heavy traffic (more like Sunday mornings)and speed is not an issue, I just like to cruise (leaving plenty of room between me and the person in front). What I don't like is the feel of the car when it goes into a curve (or even a slight bend in the road). The faser I go the more "float" the car has. Have you upgraded your suspension? Why would you go with the 4 leaf springs and not the 5 leaf mid eye? Are the 5 leaf more then I need and a wast of money? And shocks, did you go with the KYB GR2 or Gas-A-Just. Most of all did the money you spend on the suspension show up in the way the felt and handled on the road? Again thanks.  

Last reply was for soaring3. JAY67FAST thanks for your input too. I would like to do both, but I can't at this time and it looks like I can do the suspension for about half the money. Bottom line is I just want to enjoy my 65 more. I'll keep thinking about it and thanks again.  

The reason for the 4 leaf standard eye, is that it will put your Mustang back to a factory stance.  The 5 leaf will raise the rear, and will jolt your teeth out when you hit a bump.  The standard leaf is just that.  Standard as from the factory.  The mid eye raises the car a tad and the reverse eye raises it even more.  Your Mustang will look like a stink bug going down the road with that spring.  The KYB gas adjust shocks is what I have on mine.  I can take a curve that is marked at 30, at 50 now.  I used to get scared as hell just going 30.  In addition to the springs and shocks though, I think my montecarlo bar and my export brace did more to stiffen up my front end more than anything.  Depending on the miles you have on that 65, you might also want to consider a new suspension system other than just the 620 springs.  I only have 130K on mine right now, so am not due for another 50K or so.  Here is what new 4 leaf standard eye springs on the rear will make your 65 look like. This is the butt end of mine after I replaced the rear springs with 4 leaf standard eye.
 

soaring3:
I disagree.  My 65 has had shoe brakes on it for 43 years and it stops just fine.  And back during the 60's and 70's there were millions of these cars driving on our highways with shoe brakes. For handling purposes, I would get the new springs on now.  The 620's up front and the 4 leaf standard on back.  Also, put new KYB shocks on all four corners.  Put on an export brace and a Montecarlo bar.  These items will make all the difference in the world as far as handling. Then when you get your piggy bank full again, get a disk brake kit.  If you are good with your hands and like to make things work, then go to the junk yard and pull the brakes off of a 1977-84 Ford Granada or a Mercury Monarch and refurbish it with parts you get from AutoZone.  If not, then get all new parts at Autozone.  That will cost you less than buying the SSB kit.  The brakes and spring projects are doable on a weekend if you are pretty good with tools and figuring out things
Here is an article that will help with the brake swap.  Just copy and paste this in a search engine.  
http://www.vintage-mustang.com/topics/faq/drumtodisk.html

Well I would like to stay with the drums for a bit longer on a 65 Mustang I am building. I do have the double reservoir vs. the original single and need to install it. Looks pretty basic except I will have to add a block I think that will address another brake line.

Also is installing a Booster that big a deal? Should I get a booster or not. Thanks  

I am going to put on some rear leafs that I bought that are new but I am unaware of the 5 or 4 Standard eye. The shackles that came with them have four holes so I am assuming that with the correct placement in the correct slot will even that stink bug look you are talking about. Is this a correct assumption? Thanks