Get ahold of JWT technology. If you are making a racetrack only car, the C3 series cams will be kick ass. They require new springs, and come with titanium retainers. If the car is gonna see some street duty, the C2's will work good for both applications. If for some reason you don't want to do valve springs, there are lesser powerful cams that don't require them. But I would get the C2's or C3's if I were you!