Extra octane will not hurt but may be a waste of money unless you tune for it.
But alcohol free will ALWAYS be better!
Yah, I know some folk claim E85 is the cats pajamas, but for classics any alcohol is more like the kiss of death!
Twin-Cam Hemi, Webers, Headers, Overdrive, Disc brakes, and no emissions equipment to spoil it all. These are gonna be FUN rides!