Right now, there is a brass plug in the carb. I bought it that way, but believe there should be a vacuum nipple there. I found a few diagrams online, but they are vague and the illustrations are horrible. From what I can tell, the vacuum advance goes to a port on the front of the carb. Still unsure about the rest.
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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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