1966 Mustang engine stalling

Happy 4th to everybody. Just bought a 66 289 C code, automatic. Drove it home and cruised around for a while, everything was OK. Then it started stalling out--finally would not start back up. Let it set overnight --it started right up--drove it home. Any professional guesses on the cause? Take it easy on me, it's my first Mustang.  

Not enough info Richie. It could be a lot of things,,, what do you mean by stalling ,,did the engine stop ,,,did it lose power. It sounds gas related if it didnt just quit all at once. A whole lot of possibilites. When it stops look down the carb and pull the throttle and see if it squirts gas,,,then you know you have gas. Give us a little more to go on.  

Yep, not enough info.  You might want to look if the choke plate is stuck closed.  Also how does the engine sound when it cranks? like its trying to fire or just "chuggin"?
Do you have spark coming from the coil wire to the dist when cranking? (hold it about 1/2" from ground while someone else cranks it)  

Most likely you heated up and had vapor lock.  Vapor lock is a condition where the gas in the carburetor is so hot that it turns into vapor and won't fire in the combusion champer.  The way to solve this problem is to make sure you have a phenolic carb spacer under the carb so that heat is not transferred from the manifold to the carb, and to make sure that all your gas lines are well away from your exhaust manifolds.  In the old days, we could cut out a 3/4" piece of plywood to make a heat resistant spacer, but today you can buy the new technology phenolic spacers that are made out of plastic and wood.  Good luck with your vapor lock problem.  

Interesting theory there Soaring, but vapor lock refers to heat in the fuel lines when the gas turns to vapor it can't be pumped to the carburetor as your pump is designed to pump liquids. In fact gas does turn to vapor in the combustion chamber, if it didnt it would never unite with those old oxygen molecules and burn. Using a phenolic spacer is good for keeping the fuel cooler in the carb bowls and not boiling off, this aids in hot starts where fuel can boil off quickly. For vapor lock, generally, one would insulate the gas lines to and around your fuel pump. The problem is generally close to the fuel pump and you can buy insulating materials,,,,,if indeed that is his problem. He hasnt isolated it closely enough yet to say that, you could be (well partially) right.