Dont’t know what the reference is to V19 heads but all the dyno runs I have mention the same head.
My understanding is the motors were built in the Engine Room to factory specs as listed in the SAE reports.
As for fuel, several different engine tests that I have seen mention Pure Race. Puzzling because Sunoco 260 was good enough for a 12.5 to 1 Race Hemi at least up until the early 70’s.
My guess Pure was a known supplier and had the contract to supply fuel in bulk to the tanks in H.P.
