Edelbrock 7576 Air Gap on 318

As SirDan mentioned the LD4B is a great intake. Another older intake that was very good was the Holley street dominator. It was a single plane intake which doesn't always lend itself well to a small cube engine but it was designed with small ports and plenum so it worked on the 318 real good. One thing to ask when buying a used intake is has anyone ground on it. Sometimes what people do to try to make something better isn't always a good thing so I generally pass on a modified intake unless they have very good pics of what was done or I know who I'm buying it from well enough to trust them. I've seen a couple for sale lately priced very reasonable so you might look in the for sale forum. If you can find one with the balance tube running across the back from the #7 to #8 ports I hear they work the best. I've only ran the style without the balance tube and they worked great for me.