Get a better intake manifold. Skunk 2 makes a good one, you can here the crossover better, and you make a shit load more power throughout the power band. Also look in to throttle bodies. As far as cams go i like skunk2, just make sure you get better valve springs and retainers. Not sure how well that stock valves hold up. Also can't you get a different head gasket to increase compression a tad.