I've seen what just adding Stage 2 cams can do. VERY IMPRESSIVE! Kurgan ran consistent 12.80's before them. Yesterday at Bradenton (45*) he ran a 12.24@110! SO that's my vote.
Well, Bill picked up about 22RWHP. Pretty impressive. He also has a Bullitt intake and longtubes, so he probably saw good gains like that from the support of better flowing intake and exhaust. I believe he's at around 280RWHP right now, and he hasn't had a custom tune for the cams.
well you don't have to have a super aggressive cam. as a matter of fact i don't think bill went with a really aggresive cam, stage 1 or 2 if i remember correct. bill drives his everywhere
The 99+ heads already breath pretty well. I would recommend cams and LTs. Of course, doing cams means pulling the heads, so you might as well save up and P/P them as well while you have them off ...