I would not try to heat the fuel before it goes in the carb, ever heard of vapor lock?

Mabey if you had EFI you could wrap a heating coil around the fuel rail

The only big gain I think I have left is the OD trans. It should be at laest an easy 2 or 3 mpg.

Other than the trans; things like EFI, custom headers, custom cam, skinneyer wheels, weight reduction... might get me another 2 or 3 all together. Mabey for another $10,000 I could get closer to 40mpg so I can save $2 - 3 grand..