Looks very similar to a 1970-73 Z/28 air cleaner but doesn't match exactly...
See pictures here-
https://www.ebay.com/itm/1970s-1970-...sAAOSwvaBcufmJ
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1972 Chevelle Heavy Chevy 402/TH400
1972 Chevelle 350/4-speed convertible - SS clone
1974 Camaro 350/4-speed driver
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