Does this prove David Vizard's 128 lsa formula ?

The difference for the caprice was compression ratio too. I can’t believe this isn’t a bigger part of this discussion. All of this discussion also seems like all out racing applications. It’s not. Sure, run the tight separation but dialing back your timing to run on pump gas is a power killer or don’t and kill power with detonation.
I did state probably most of the power difference was exhaust system related. But you are correct in that the Caprice had slightly lower compression.