Today's fuels have a much lower boiling point due to additive and ethanol content.

What does this mean for your old-school technology?

The steps for adapting to the current fuels is easy, simply add insulation between the manifold and the carburetor.  This insulation keeps the gas at a cooler temperature to prevent: vapor locking, boiling, fuel drip, power loss and many other detrimental side effects of hot fuel.