Huh? The Edelbrock Performer has 318 runners and works great on a stock 318. Good upgrade for an intake the goes for less than a hundred bucks used. The eddy rpm air gap and performer rpm have 340-360 runners.
I say eddy performer and holley 4160 600cfm carb work great. Although if the performer is a spread bore will have to buy an adapter plate, which is a good idea anyway to help keep heat away from the float bowls.