I finally got around to putting a new engine in my SS. The rebuilt bottom is 40 over with a Liberty kit & Speed Pro flat pistons. I got new 64cc alumium heads that give me 9.8 to 1 com. I use a Comp cam xe268. I have a Edelbrock proformer intake & 1406 carb, a new HEI dist. & MSD-6a . I have around 250 miles on her so far & I love it.