Should I buy it???? Need to know today!

I have a chance to buy a 1974 Dodge Dart swinger special. 318 2 dr hardtop. Ralley wheels disc brakes. Car is completley disassembled. Interior accept dash and column is out. Front fenders and doors are off. Glass is out. All parts are accounted for. Car was going to get a resto and owner is not interested in putting it back together. He is asking 800 but I think I can get it for 500. He claims no dents and only LF floor rusted. It is a white car with blue interior. Man I dont need another car. Kind of hard to pass up. Oh it has numbers matching engine and trans. Should I part it or put it together????