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I would expect twin plug at 10:1 static on 91 to be safe, especially if you tune for it and don’t advance ignition too far.
What cams are you planning to run and (thus) what is your dynamic compression ratio? If you run a decent amount of overlap + lift your DCR will probably be more like 7.5:1 (approaching ~8 at higher RPMs) and thus plenty of margin.
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1978 911 SC (3.2SS, EFI, 993SS cams + the trimmings)
Dynamic Comp Ratio calc: https://dcr.questionable.services/ • Gearset & Ratio calc: https://ratio.questionable.services/
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