as i keep looking for my 62 bout the time i get a pile i run across something that mite be worth having. old guy up here has a bunch of mopars in barns and out buildings. most are virgin tin. very few folks have been up there. super happy i was let up there. .... what im looking at and the only car for sale is a 72 RR /GTX. it has a 440 6 bbl 4 speed high price range but has no A/C or power windows. .. so heres my question. .. the vin shows a Z in the engine spot. sadly he said no pics aloud. i have never seen a Z code nor a 6bbl in a 72. build date is 11/71... so what am i looking at here?? one off or a knock off??? .. thanks.