Mixing Sunoco SS 100 to 91 Octane-Any Negatives Besides Price?

In California, I’d like to raise my fuel octane from 91 to 93 (to prevent knocking) by adding pump Sunoco SS 100 (7 gal 91 octane/2 gal 100 octane). Carburetor/1967 440 engine. No catalytic converter, oxygen sensor, etc. Can this expensive racing fuel cause any damage? Just want to double-check. Sunoco Race Fuels

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