Passenger side, top corner of the cowl. It vents in outside air when "VENT" is selected. And seals out the outside air when the AC is on. There should be a vacuum pod and a linkage rod on the underside of it. It was a real SOB to get back in, I really fought with it when reinstalling it in my car. I hope you have a much easier time than I did.
And for converter bolts, go to your local parts house and get the correct bolts.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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