I would be checking other locations for the vin number if possible.That "D" is for a plant in Doraville, Georgia that never made Corvettes as far as I know.
Maybe its a stolen car?
Looks like they made a Monte Carlo there in '76.
https://en.wikipedia.org/wiki/Doraville_Assembly
https://en.wikipedia.org/wiki/List_of_General_Motors_factories
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