[Bruce Edwards]

Chuck,

Are you using the heat crossover on your intake? What size gasket are you using to mount your carb?
The FE engines will make a lot of under hood heat and will boil the fuel in the carb. It is best to try to keep as much heat of the carb as you can. Shelby used the cold air box to help keep heat of the carb as well as force fresh air in the engine.
Installing a insulator style gasket will help keep the heat away from the carb. Also keeping the fuel lines away from heat will help from pre heating the fuel and getting it close to the boil point. Winter blends are set with a lower temp to help during cold weather so an octane boost in the winter may also help.