I think it would be a better test at 500”, with a combo where the TF heads were making well over 600hp.

Something that can really illustrate how much power the milder heads are leaving on the table.

Was there any attempt to equalize the CR between the various heads?

Or was the CR difference part of the power difference?

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads