Help on fixing a vapor lock!!!

Do the Fuel line mod. Make sure your manifold heat control valve is intact, free, and working. Make sure you have the correct thick insulator gasket between the carb and the intake manifold. Make sure your carb is in good condition with a float that hasn't taken on gasoline. The Daytona Float Valve is just a rename of the "Duro-7" inlet needle/seat that used to come with Tomco carb kits, but whatever we call it, it's an improvement—don't know if they have them for the Holley carb I have to guess you have (no year or carb info specified in your question).

Better ignition helps a lot with bitchy drivability issues like this, too; do the HEI upgrade and pay attention to the tune-up parts and technique suggestions in this post.

More broadly: mind the difference between vapour lock and percolation. Vapour lock is when a persistent vapour bubble develops in the fuel line in such a way that liquid fuel can't reach the carburetor. Percolation is when fuel boils in the line and/or carburetor, forcing its way out of the carb bowl and into the throat, flooding the engine.
Most of what people call "vapour lock" is actually percolation.