Buy New or Buy a Parts Car

I came across a 72 Dart 2-dr slant 6 auto parts car I can get for around a grand. It's complete, motor, trans, and it runs. Im thinking of converting my 69 Cuda to street duty, so I'll need the heater box, ducting, some wiring, ect. I might use some interior pieces too, if anything fits (seats, door panels?)
Do you think it would be worth it to buy this parts car, or should I order all new/rebuilt stuff. The cuda is not gonna be a resto, just a driver. for now.