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Run the vaccum advance straight to the carb and bypass the solenoid on the air cleaner.



I don't think OSAC valves were around in '72.



'76?



I didn't look like a '76 air cleaner housing to me and I didn't see an OSAC valve in the pic, but you're right, I didn't read closely enough.

No ill effects from blocking off that exhaust port, SWPC. It might even be easier to cut a new plate than to plug weld the 3/4"(?) hole on the existing piece.