Jeff
Of course if you’re a factory HP nut, then the 70 455 is hands down the winner. Rated at 370, the 70 455 is right there with RAIV ratings. Only topped by the 69 428 HO at 390.
The 71 455 is a mere 335 which puts it in the category of the garden variety high compression 400. Even a 69 350 HO is rated at 330 HP.
Obviously you can tweak any motor around any of these figures, this just makes for some good table top racing.
Some Figures