318 4 bbl and intake upgrade

A 500 cfm is plenty for a stock 318. A 750 is way to big for a 318, the 340 intake manifold would cause port mismatch. The op said that his 318 is stock. Go with a weiand action plus intake manifold and a carb spacer and a edelbrock 500 carb. Also go with a good flowing exhaust system, a 2 1/4" system is fine
500 cfm might run 'er well... but .. if a little is good, then more is better, least that's the way I'wuz figure'n.. So I just went aheeed and put 2 of them ther puppies on my 318 just to be sure she didn't run a tad short on my 318.... and bumped 'em up to 600's apiece..... Jeeest to make shore ...
dscn2845-jpg-jpg.jpg