I have a 1967 firebird with a 400 in it. It will die randomly when usually when hot and idling. It will die unless I press on the gas pedal. After I shut it off the fuel floods the carb. I have a new carb, mechanical fuel pump and have the fuel lines wrapped with heat tape. I read something about the fuel boiling. I am wondering if anyone knows how to fix that problem. Octane booster?