Originally posted by dreamrod57
I have been thinking of building a stock 5.0L sbc for a hot rod build. and was thinking of how could I duild one to get 30+ gas milage out of it.

could a aftermarket EFI improve the performance, and milage in a stock 305?
EFI would help as would a overdrive trans and a super high gear ratio. A flat top piston instead of the normally dished piston would help also to promote better combustion of the fuel = more efficiency. Wide lobe separation angle and short duration cam would help also. 30+ is a tall order, wish you the best.