I've done several 71 GTXs, including an OE Certified car. I love them. BUT, they are some of the most difficult Mopars to find GOOD parts for. They are very rust prone, especially compared to the earlier models. They changed a lot of stuff every year, so little fits one year to the next. They were very low production. Almost nothing from the 4 door cars fit the 2 door cars. Many, many items that often need to be replaced are difficult to find, in particular the valances and upper door panels. Heck, the RRs used no less than 4 different rear valances in 71 and 72. And none of them are in repop. I could go on and on. I really do love these cars, but you should look real hard at what your potential project needs and what is available. In my humble opinion, these cars are some of the most problematic cars to fix right. Sorry to be a downer.