It's not a Mopar comparison but it is somewhat relevent to the arguement. I think it was Hot Rod a few years back that built two engines, a small block 406 and a big block 406, same cam profile. I cant remember the Dyno numbers but the big block heads flowed better so it kicked butt on the small block. They both went in the same Chevelle with the weight the only difference, the smallblock managed 12.50's I think and the big block ran 12.30's or 12.20's, even with the weight disadvantage and the same cubes.
