How do I stop vapor lock?

Funny how nobody questions where the vapor in the filter came from. It flows backward from the carb bowl where fuel is percolating . What did the factory engineers do ? 2 changes.... thicker spacer underneath the carb. Filter relocated to a vertical position in front of the water pump and where the fan forced air can hit it.
These 2 changes and verifying the bowl vent is open at idle cured my 67.