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Paul,
Your first post says the vacuum port on the 74-77 dist is plugged - so there should be no difference between plugged or unplugged.
If it ran good before Pertronix with 9 deg BTDC at idle - I'd set it back to that. Pertonix won't allow any more or less advance.
You don't say what you had your total timing set to. Seems like you should be able to shoot for 28 to 30 deg total.
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Rex
1975 911s and 2012 Range Rover Sport HSE
1995 BMW R1100RS, 1948 Harley FL
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