The majority of modern cam grinds that are "copies" of the 068 already have lift numbers that reflect 1.65 rockers when using 1.5 ratio rockers. If you choose to use one of these aftermarket cams AND 1.65 rockers, it is in your best interest to have the heads set up for the additional lift and have the push-rod holes enlarged. In addition, you will have to convert your screw-in studs to 7/16" and get adjusting nuts (Poly-Locks) to maintian proper valve train geometry. Also, I advise going to larger diameter pushrods, sized for the cam / valves / rocker set up.
