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Proper fuel for 71 high compression

I just purchased a 1971 Pantera with the high compression engine. It has a 600 Holley and electronic ignition, but is otherwise quite stock.

I have read and heard various opinions on fuel. The majority seem to recommend 94 Octane with 104+ Octane boost Racing formula (1 per tank) and slightly(?) retarded timing. Others have said it (the 104+) will kill the rings over time. Any expert advice, or real authoriy reference out there? Thanks,
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