Blocking the heat crossover is a huge help as is running an electric pump out back. Reason being the line from the pump to the tank is under a negative pressure and more prone to V/L. Stay away from Ethanol based fuels if possible. And as stated a higher pressure mechanical will help and the holley's can take ~ 7 psi on the safe side. try to keep the lines away from heat sources. phenolic spacers under the carbs can help as well