Hot soak fuel condition,edelbrock

[LSR]

Hello,everyone,this is my first post here,so here we go. 1969 chev pu,350 cid,th400. Truck has an edelbrock carb,and when let sit after a long run,temp naturally rises and starts to boil the fuel out of boosters,then a rich start condition. I have tried all the fixes I can think of such as,Thickest insolater gasket ,lowering the floats,epoxieing the 4 plugs in base plate,pressure regulator set and checked 4lbs.fuel line isolated from heat,being desperate I went old time and placed wooden clothes pins on fuel line "Old time ford trick",still have issue. Inoticed the fuller the gas tank the worse it is.Tank is in stock location behind seat. Maybe one of you have heard that the older trucks with tank in cab have a tendency to push fuel from gravity,being tank is almost as high as carb. Has anyone have any insight to this,Im thinking theres a Q-jet in my future.