I think that the mechanical fuel pump adds a lot of heat to the fuel. I think you're better off switching to an electric pump and insulating the fuel lines around the engine. See Vapor Lock.
I read that link recently and its one of my reference points. Im trying to stay away from the electric fuel pump due to cost/reliability concerns. Also my issues are never that severe, hard starting and bogging with more than 1/2 throttle. Mostly just annoying.
Ill start with blocking the heat crossover during summer months, insulating the lines, and look into controlling underhood temps. I'm thinking header wrap, hood vents and maybe diverting the radiator air away from the carb/intake as mentioned by @AJ/FormS above. Anything I can do cheap/free ill try, and report my results.
