Well, for lightwieght and look factor I would go with aluminum heads. Around a 180cc runner and 64cc chamber. If you have the money go with AFR's. If not, go with the Dart Iron eagle heads. Throw a single pattern cam like the 270H Comp Magnum in it(224 duration, .470 lift). It's small enough for street and will still sound good. If you want a little bigger go the 280H(230 duration, .480 lift.) Will lope a little more but you're getting a little closer to street/strip. If the budget allows, buy a hydraulic roller cam about the same duration as I listed. Run a flattop piston or small dish piston, run at least 9-1 compression. No more than 10-1. Use a dualplane intake. Anyway you do it should make over 400 horsepower. Closer to 450 when tuned.