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Message: <blockquote data-quote="Dalamar" data-source="post: 10096" data-attributes="member: 8116">That's tough to say exactly, depends on what cam you do. Maybe a crower supercharger spec or something.I doubt you'll get over 120 HP tops, with the right cams and a very good tune.You'll still have the small NPI headports, and a limited valve stroke.most ppl get around 50-80 at the wheels using NPI heads, intake swap will help some, cams will2, hard to say exactly.Looking at all that, I'd compair to a PI headswap, since you're looking at options.On the supercharger, not many Posatives are avaliable to bolt onto NPI heads. (none worth mentioning)I personally like the Posative displacement type better - BC you get your increase in power over most of the rpm range.A centrifical will fit up, and you can run you're 410's with it, bc low end torque / traction isn't effected.Traction is also directly related to your tire width and how good they are.</blockquote>