Are you sure it's Vapour Lock?Many fuel problems are ignition related.
How's the ignition components?Check the points,plugs,rotor,condensor & cap.Pitted points will stick after a hot shut down/restart.Getting good current to the coil?A faulty coil can act up with the symptoms you describe & fire up after cooling down.
Advanced timing will tend to make the car run hotter.
A faulty battery earth can cause problems too.
An old trick is to start the car up,in a dark area & have a look for any sparks jumping around the engine bay.
If none of these are the problem.........at least your car will be running better!
Now to the fuel delivery........First thing to look for is fuel pump pressure.A mechanical guage will tell & if it's not up to scratch,could be the pump.Check the filter & blow the fuel lines to the tank.
Check the fuel line from the pump to the carb & see if it is coming close to the block anywhere.With a stock system,especially around #5 cylinder.
If it looks too close you could wrap it it some insulating material as Zoltan said.
Check the choke flap operation for sticking & float level.
Finally...a carb spacer will insulate the carb from manifold heat & stop the fuel percolating in the bowl.