69FBCuda said

Did you check timing at 3000rpm with the vacuum advance

66fyssh said

Initial Advance - engine at idle and vacuum advance plugged

"all-in" - vacuum advance still plugged, increase engine RPM until timing stops increasing. This is where you want 32-36ish. I'll add, this is the combination of initial plus mechanical advance from the weights in the distributor.

Then when you add vacuum advance it can shoot up into the 50's.

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Thank you. This makes sense now. I will test this out again to confirm the mechanical advance. Suspect it’s going to come in at 57deg minus 12deg and be around 45deg if my math is correct. Still maybe to much mechanical advance?

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