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There's a slight glitch in one vac hose. The AC idle up is connected to the emmission spaghetti pipe. Try connecting AC to the AC vac solenoid.
For the spark knock, try swapping the vac hoses on the advance can. That will reduce the vac advance from 18* to 7*.
Just outta curiosity, is there an electric fuel pump right beside the mechanical pump? Which one is in use & why?
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Thanks,
Jim C.
TLC Performance
Underhood Janitor, cleaning up other people's  since 1988.
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