I agree with the previous poster (68Chevele) that the stock L78 cam (.520 lift/242 degrees duration at .050 lift/114 degree lobe center spacing is a good cam and provides sufficient vacuum for braking. I however, opted for a Howards cam with the same duration and lobe centers spec for my '69 L78 396, but with an additional .019 valve lift. This cam provides slightly more power without changing the engine's "manners".