I had very similar hot start problems with my 360/Eddy Performer Intake/Eddy 600 carb.

Ended up putting a carb insulating gasket on and it made a HUGE difference. There are several different patterns depending on your carb/intake combo.

https://www.edelbrock.com/catalogsearch/result/index/?p=1&q=carb+insulator+base+gasket

BaseGasket.jpg