There is no late model car that would do you any good. Any of the other "A" body cars from that era would have seats you could use, and possibly some interior trim like door panels and kick panels. These cars are Chevrolet Monte Carlo, Pontiac Tempest, Pontiac Le Mans, Buick Special, Buick Skylark, Oldsmobile F-85, and Oldsmobile Cutlass.
Interior parts for your car are readily available from many sources on the internet, you might as well make it as original as possible.
BTW, the term "matching numbers" is somewhat of a fallacy. It would be impossible for a car to have an engine, transmission, or other drive train components that were made specifically for that car and had numbers on it that somehow tied it to the car's VIN number. The engines and transmissions are built in separate plants and sent to the factory to be put into the cars on the assembly line. The only thing that would indicate that the "correct" engine is in the car is if it was the correct size engine and was manufactured before the assembly date. That would be true of the transmission, and the rest of the drive train as well. A car could have all the original drive train in it, and there would really be no way to prove that was true. The only thing you could prove is that the components were built before the assembly date.
No one lives forever, the trick is creating something that will.
Last edited by DanTwoLakes; 11-11-2012 at 08:53 AM.