Uncle Bob:
Should I waste my money running high(!?) octane in my V8-60?. It has Offenhauser 10:1 heads, probably 9.5:1 with the relieved block, and a nasty-azz Clay Smith cam. Back in the day, I probably ran regular; but back in the day, regular was probably 92-94 octane. It's hard to hear a flattie pinging, especially in an open roadster, and I wouldn't want to melt anything expensive.