Streetmaster 318???

The streetmaster 318 is a decent intake, its a single plane but because of the small ports in maintains port velocity pretty well. The edelbrock performer, and especially the performer rpm or rpm airgap are better manifolds, but if you can get the streetmaster for a decent price ( I got mine for about $100) its a good intake.

The 1405 is ok, but 500cfm is a little on the small side I think. It'll work fine for street use, but it'll be a touch small at high rev. I have a 625 cfm carter AFB on my 318 with my streetmaster intake and it works well, I had to jet it down a little (2 sizes on the primaries and 1 on the secondaries) but it pulls hard and is pretty responsive considering my freeway gears and stock 904 transmission. Only other mods I have are a set of 1 3/4" hooker super comps (this 318 is in my challenger). Overkill for the 318, but they're for the 340 that will go into it later.

With the carb, intake and headers though the 318 is a whole different animal than it was stock, feels much stronger and more responsive than with the manifolds and stock 2 barrel. A cam would be a big help too, but with a new engine going in mine I'm skipping it.