Running straight 110 octane leaded on an engine with mid 9:1 compression and the closed chamber Edelbrock heads is probably a waste. I don’t see any reason your engine shouldn’t run on 93 octane. Case in point is a 391/318 stroker running 11.2:1 on 93 octane with the same XE274 cam and Edelbrock top end. It ran best on 22 degrees initial with 32 degrees total timing with mechanical advance only, but it was in an obscenely heavy truck.
