Distributor Install for first start. Double check my work!

cosgig said

-20btdc seems a little early. I always set mine at -12btdc, but I’m sure it will fire and be adjustable from there.

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I missed that. if the distributor hasn't been recurved it will have too much mechanical in addition to the 20 before TDC
set timing at 5-10 degrees before TDC if using a factory curved distributor.