What I would shoot for would be 325-350HP. Very reasonable goal and you should be able to get there with your budget. The Hughes Whiplash cam for the 318 would sound good. But remember, then you'll need a matching converter and better gears. More money. I'd concentrate on power output instead of sound.
That is a very good idea to concentrate on power instead of sound. I never thought of that and that’s a good way to put it. But I’m really trying to shoot for 400.