Therx7ist

My new rebuild has 850 miles on it. Unfortunately, while putting on miles, I got stuck in traffic for 2 hours, and overheated the car. The car blew out it's coolant, but I don't THINK, I did any real damage. I see no bubbles in the coolant, no smokiing exhaust, and no coolant is present when cranking without the leading plugs in. For some reason though, the car will start with a little of coaxing on the first try. After she runs for about 3 minutes or so, she will stall if I don't keep my foot on the gas.

After stalling, the car is almost impossible to restart. I have the TB mod done, and all emissions have been removed. Where should I start?