Was the 1975 sale a "private party" sale, or was the car sold through a dealer or broker? If so and that business is still around, you might start there. Of course, most businesses do not keep records for more than 8-10 years at a time.
If it was a private party sale, well....maybe go to the library in the town where it was sold and scan the classified ads on micro fiche for a few months before and a few months after you think it was sold. You're bound to turn up something, perhaps a phone number or address than can be traced to that owner or their survivors.
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