A little more oomph

I ran an average run o the mill 600 vac sec Holley on my 318. Yes it ran good,it was easy to tune. I dont think it was the best as far as MPG matter of fact i recall it taking 50 bucks 20 years ago to drive it around from friday to monday LOL! i still have that carb I like em. Im running a 750 edelbrock on my 340 though...I would say if ya wanna try a Holley try a holley if ya wanna try something else swap em out. its good to have a few carbs on the parts shelf for different applications. i think the basic formula is take cu In and double it thats your CFM. 318 x 2 = 636 600-625 size will run on a 318.