Newbie Super Six question

All I did was modify my stock iron 1brl to fit a holley 2brl, put a 265 solid lifter cam from clay smith, and hogged out my iron exh to match head ports. I'm getting about 22 mpg needs some tuning but works great. Would like to try a weber 32/36 and electronic ignition to see it I could get closer to 25 mpg