I never buy a vehicle without Title. If the GMC does NOT have a frame number, you can use it's chassis with a body that has a Legit VIN and title. It would be like buying a FatMan chassis for a truck I think. You can not, however, grind off or fill in the frame stamp on that 4 link/Camaro chassis if it has one. You will have to see what the Gendarmes say. The question, Where did he get it? Does he have Bill of Sale? Can you contact the previous owner? Why no title? The price should be very very cheap...1. No title, 2. Not many buyers interested in those mods, 3. Mods may be done shoddy. 4. Risk re: untested components (can't drive) 5. Torn apart may be missing parts.
Look on both sides of frame. Cletis (moderator) knows if and where it is. In Arizona, they don't look at the vehicle, just transfer the title.