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Nothing wrong with big dreams, but yeah for a while I also had the impression this was going to be a build with a generous 5 figure budget.
I'd say that if OP needs to rebuild their engine anyway, some modern internal surface treatments seem very reasonable. A kill switch is superior to DFCO in almost every instance, and far cheaper to retrofit. Adding lean air mixtures at part throttle would probably be my #1 recommendation if you're going to re-tune it, before any head work.
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