vapor lock???????

Sounds like you are ready for the fuel line mod.

Here are a couple pics.

The theory is to get the fuel line away from the heat of the motor and exhaust.

The fuel filter sits behind the alternator which is cooled by its fan blades.

A spacer under the carb is mandatory for a cool carb.

Also make sure your heat riser is working properly,or a least wide open if you have a stock exh manifold.

Good luck !!!!

John