[Kenth]

First check for original style and size of inlet valve (.101" viton tip).
Check float settings (23/32" and 1 3/4" drop).
Check float bowl vent.
Check fuel pressure a while after shutoff, (have the meter connected while driving until the engine reaches normal temp.)
A remedy could be a fuel filter or a fuel pump with vapor return.
But, then you would have to add a return fuel line to the tank and a pickup in tank with a fitting for this line.

My solution expering the same issue 30 years ago was mount an electric fuel pump with no check valve (Carter P4070 5psi) that would make fuel expand in the fuel line, from the hot engine, between the mech pump and inlet valves in the carbs.

HTH