Need Help Researching My Car

I am new to the Mustang Owners Family. I purchased my car from the second owner. He told me it is quite Rare. It is a 1973 Mustang "Sportroof" "Q" Code Car. 351 4v Cleveland, Factory Hurst 4 Speed, Factory Competition Suspension, Factory Forged Alloys,It is that "Dark Green Metallic."  Another thing that was kinda cool was that it was sold New at a Dealership in New Jersey on "ROUTE 66."
I'd like to try and find out how rare it exactly is. He told me that not many were made in this color with this package. In addition he gave me a copy he had sent away for,of the Original Invoice.
I really like the car and, would appreciate someone that has lived and breathed these for a while, to help.  

You would be wise to purchase a Marti report for your car. All your questions will be answered. Here's their web url:
http://www.martiauto.com/