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The factory ignition timing for your single plug 9.8:1 engine was "not more than 25 BTDC @ 6000 rpm" Max advance is in by 4000 rpm. This was for 98 RON fuel. Upstate NY is still in the US and fuel is sold by CLC octane, 93 CLC is close to 98 RON. You may get away with a few more degrees of timing, especially at -20F, but this engine is knock limited and the advance will be less than ideal with pump fuel.
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Paul
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