3310 Holley does not have 4 corner idle mixture provisions. Nothing is missing or fell out, they're blocked off.
Just clean it up and rebuild the carb and run it like others have said. with those 4:33 gears, it should be a monster driving around town. There were 4.56's in my car when I bought it and it made for some impressive straight line acceleration.
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Triple Black 1971 GTO
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