What Fuel to use in a 1966 Stang?

[Kisner]

Thanks for the info. Just wanted to be sure I didn't need a lead additive. I've always used unleaded fuel only because the only reference I could find was in my reproduction copy of the orginal owner's manual. It said to use premium fuel with at least a 99.8 octane rating for a 302 4V. I "assumed" they meant unleaded when they said premium since there was no mention of leaded or unleaded fuel. I've always used the 93 (highest I've ever seen in my area) since the manual said a minimum of 99.8. I'll go with the 89 next time and see if it pings.