360 stock intake manifold on a stock 318?

Other than the old edelbrock ld4b I don't think there's an intake that fully matches the 318 ports. The edelbrock performer is half way between 360 and 318.

It's all compromises sure all these little things can add up hp and $$$ wise but no point stressing over it. Slap a 4 bbl on you will be glad you did.

Add a mild cam while at it you will be really glad you did.