I was looking for a cam that was used in a dyno test and ran across this: How To Build A Kick-***, Pump-Gas, NPAA 680HP Small-Block Chevy - Car Craft Magazine
I do not intend to start another war about SCR vs. DCR. But this tends to support, at least in part, the idea that even nearing the extreme ends of the spectrum that more cam and more compression can run on pump gas. The engine is a big sbc, made 680 hp from about 440 ci (equivalent to a 355 making about 550 hp). Compression is 11.4:1 w/34 degrees total timing. AFR aluminum big port (245cc) heads.
To be honest, had this come up elsewhere, my opinion would have been to not run it on pump gasoline. They don't say what
pump gas was used, but presumably it wasn't some ringer 100 octane race gas from a pump. And if it WAS, they need to have their *** kicked.