The 'Quickest' A-Body Small Blocks

1968 ~ 340/275 hp ........... 299 hp
1971 ~ 340/275 hp ........... 314 hp

I would say about 15 hp better between the intake and thermoquad using your NHRA hp factor numbers above. And the 68 has a very slightly warmer cam and on paper .2 higher compression ratio. But at any rate I like how my 71 demon runs with the mechanical 6 pack !!