Yes I know there are a lot of variables, but my recently aquired 66 Hemi Coronet has a well done conversion from a slant-six to a hemi built by Jim Gosselin: BMP iron block, 472 ci, Indy heads, forged crank, rods, Diamond pistons, 10.9:1, runs on 92 pump gas, aluminum 2x4 intake with 2 edelbrock...