You are probably out of luck unless you can find the "build sheet" usually located under the carpet, but most of the time that is missing. There is also a plate on the radiator support, but it has limited info.
If your car is original, you can check the rear gear ratio, you would know the trans 3sp, auto, 4sp, the body color can be determined by looking behind the back seat, there is not much else to find out. Have a new data plate made. You have the VIN.