Originally Posted by Dajerseyrat
Just below 9 psi. but the car has a nascar style fuel cell with 2 fuel pumps one on each side.
Edelbrocks and Quadrajets will tolerate up to around 6 psi, but will run best with 5 to 5 1/2 psi fuel pressure. Holleys will tolerate up to around 7 psi, but will run best at 5 to 5 1/2 psi fuel pressure.
Fuel flow into the carburetor bowl is controlled by a needle and seat arrangement. Excessive fuel pressure will unload the needle and seat and blow raw fuel into the intake manifold, creating the problems you posted.
Most of you younguns have grown up with EFI, where you can make more horsepower with more fuel pressure. Carburetors are a completely different ballgame. Get your fuel pressure down to 5 to 5 1/2 psi before you do anything else.