My '71 ain't a '71...or is it?

Post some photos if you can. Also what are the first 5 letters/numbers of the VIN and does it match what the VIN is on the fender tag. Chrysler did a major refresh on the A bodies in ‘73 so it would be easy to figure out what your car started out as.

Also, don’t believe anything the seller told you unless it can be proved. Keep in mind the sellers goal is to unload the car and the easiest way to do that is to be nice. If you don’t know much about Mopars it would have been even easier to sell the car to you. All he had to be was polite, pretend he was knowledagble about the car and make you feel good about your purchase. And the GTX in his garage might not even been his but a friends car he borrowed to help with the nice guy story.