Percolation? Heat soak? Don't drive during summer??

I've been having a fuel problem since I installed a new cam/lifters. At that time the engine/heads were repainted and the engine bay was repainted...

Every time I drive the car it dies on me when its been running for 15-20m and it won't restart for a couple hours. Two times it happened when I took it out and today it happened just idling in the garage. Line from pump wasn't really hot, carb not hot at all, fuel pump wasnt to hot. Really the hottest spot was the line across from the headers on the frame area, but even that I could grab with my bare hands.

When it starts to die it sounds as if it is getting starved for fuel, I try to give it some throttle but even that doesn't stop it from dying.

I changed the fuel line to a steel braided fuel line and added a new edelbrock fuel filter from the auto store ( the one rated for 300hp, might be a little small). Today i replaced the fuel line from the pump to the carb with a stock metal line from right stuff. The carb is a 1yr old AVS2 edelbrock 650 which sits on a 1/2 phenolic spacer.

When I opened the fuel filter up while changing my fuel line today I found a bunch black soot in there.

I know I need to run a return line to the tank for vapors but I'd like to narrow down the problem before just replacing the whole fuel system... If i wasn't paying for 5k in tests this semester and next I would replace everything but I have to try and be cheap right now...

Some pictures. Smoke comes out of the carb when I press the throttle lever at the carb after the car dies.

Any ideas?

View attachment 1715598579

View attachment 1715598580

View attachment 1715598581

View attachment 1715598582
What is the fuel pressure at the carb?
May be a weak fuel pump when it gets hot