1.5" drop base, Pontiac style mitered bottom molded duct attachment.
Quick look w/o going out & going through my stacks of deep drop T/A aircleaner bases...'73-76 era Firebird 4bbl.
Through those years, there were a few slight differences, depending on PCV breather tube location, sensors, & spot welded on vac hose guides.
Mike Ransom, HeldforRansom, has contributed with many pics of the different '73-79 1 1/2" drop factory air cleaner bases.. Advanced Search function works.
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Buzzards gotta eat... same as worms.
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