Maybe a fuel bypass / regulator to send fuel back to the tank when it swells up from heat in the line. Or a simple fuel regulator to lower the pressure down to 3 psi, the floats should be able to hold that and not flood the engine. Low pressure is how I cured my three Rochester's from doing the same thing.
You probably have a nice fuel line setup, but for a test, you place two 1/4 turn shut off valve right before each carburetor inlet. Shut them off after a long hot drive and see if the problem really is in the carb or is in the whole fuel system leading up the carbs.
