67-69 Barracuda 383 Driveshaft question!!! Help

Well problem solved. I found a original shaft. They shipped it out today. The shaft that was in my car was the wrong one. It was 3 1/4 thick and really boogered up. The driveshaft shop said it was one of worst one they've seen still under a running car. One of the previous owners had hacked one end off with a hack saw and welded it up and used small yokes on each end. They couldnt even repair it, Really out of balance. Im surprised it didnt do some major damage to something