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leave it stock port, it was designed that way . If you go to main vacuum you could be pulling to much timing .
I used to play around with advance curves but the vacuum advance I leave alone .
Things that can work are heavier weights, lighter springs on mechanical advance (note lighter springs need to be checked they return correctly at lower speeds/rpm)
another trick is to reduce the amount of advance allowed by the centrifugal advance and bring up the initial /static timing the amount you reduced but you can't go to high or slow cranking will happen . there no set rule for this stuff so many variables you need to adjust .
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