Understand that speed costs money. The more speed you want, the more money it will take. About the only thing you can do right now that won't take you to the cleaners, but yet gain some HP. An aluminum aftermarket intake manifold with a 4 barrel carb with a cold air intake and some nice long tube headers with an X pipe feeding into dual mufflers. Other than that, we are talking about a lot of money with new heads, loping cam, flat top pistons, etc. That 289 isn't worth it.