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The owner of the air cleaner was/is under the impresson that it came off of a `70 LT-1 `Vette, so maybe you're not too far off?
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Corvette guys are funny. (No disrespect; I used to be one

) I've seen this done a number of times. They (we) just didn't like that Black rim around the bottom of the air cleaner.
Could it be a factory piece? Who knows; it's this old "always & never" deal again, but my money would go on it being a day-2/dress-up project.