An "awesome" Crane powermax grind because that's what was in the engine when it was in the 66 Newport with 2.76 rear gears. .427" IN. .454" EX. 260-272 dur. 204-216@ .050 112 deg lobe sep. It will idle in gear at 550 r.p.m. 18"hg. in an 8.0:1 383 and pulls to 5400 r.p.m. with a single plane M1 at 8lbs. It'll have to do until something better falls from the sky.