As stated, check the frame and windshield post condition, also if you find a Canadian car, you can have the original option the car was originally build with from GM Canada vintage service, and the price will be all over the place and depends on the quality and engine option you want and what you want to do with it, a top flight NCRS car will be more expensive but a better investment in the long run, but if you want a driver you don’t need to pay these price as you will ending not enjoying the car to keep it original, you have to get your plans first, good luck!