300bhp is going to be mega. id look at catcams or even the silly QED 460's, but the 460s really are a 5k+ cam. i dont rate the piper cams at all. i fitted some 270 newmans, with r1 carbs, wossners, head work and TLE exhaust and made 225@fly peaking at 6.5k. but then you start heading towards 300bhp the car will be a pig too drive. if you had a car that pulled from 3k up to say 7.5/8k, it would be better to drive and quicker than another car that didnt pull til 4.5/5k up coming out the bends would be a nightmare and a bitch too drive.