Reply to "U-Joint/Driveshaft damage repair"

Angelo, consider what happens if something 'silly' happens- like the oil pump driveshaft being installed upside down? It will work fine that way....until someone removes the distributor. Then the shaft, being in upside-dowm- will pull up with the distributor, then fall into the oil pan. With your welded crossmember, instead of just pulling the pan and reinstalling it and the oil pump correctly, you must pull the whole engine. There are other similar scenarios like changing the oil pump that can and have happened, to argue for a removeable crossmember. The factory did this for all Panteras built after about 1975. The dropped battery holder in the front trunk is another factory upgrade that can be easily applied to earlier Panteras.
I also suggest you drill the three 1/2" water drain holes in the bottom of both the rear frame rails, and 3/8" drain holes in the very bottom of both legs of the 'horse-shoe' shaped support members that mount the upper a-arms (one was wrinkled in your driveshaft explosion). When you drill, you'll be amazed at the volume of talcum-powder-fine dirt and rust that falls out. Also reach in the top of the right side frame rail access hole with a magnet and there's no telling what debris you'll find. I've found spark plugs, washers, old bolts and even a fair sized rock!
The busted stud for the rear swaybar is not exactly a stud: it's a disc-head weld-bolt inserted before the crossmember was welded into the car. You can drill it out from the rear, cut a larger matching hole in the front side of the crossmember and slide a std hex bolt in, then hold the hex with a socket wrench while tightening up the nut to hold your swaybar.