Is it a sedan or a hardtop? If sedan it might have a history as a state agency vehicle. NC was still big into Mopars as fleet cars in 1975. C body Plymouth Furys were the choice of the Highway Patrol through 1976 and then B body Furys until the end of the line in 1978. If I remember correctly several of the state offices in the Raleigh area used Chryslers, SBI and Governors office?