How many using an A500 overdrive ?
I hope this helps - I have lots of pics, so PM me if you want more details.
I had to remove a good deal of the loop up into the transmission hump, and move the inner transmission cross member bolt on the drivers side away from the trans, including the tube that keeps you from crushing the crossmember with the bolts. We bent a new piece to replace the removed section of the crossmember arch out of much heavier metal, but that is not sufficient in my opinion. There is a terrific amount of stress on that entire crossmember due to the torque of the torsion bars, which will try to bend the entire crossmember down to the middle. That is why the USCT crossmember is soooo damned heavy. It converts the crossmember to one like C-bodies have (which have no loop over the trans), but rather depends on the bolted in crossmember to take the load. This means that when you work on the arch you have to take all the pressure off the torsion bars (back out the adjusters) and you have to do the same every time that you remove the bolted in crossmember. That USCT bolted crossmember also has to be cut back and the bolt moved away from the trans to match the work on the arch. Once you have the trans put up on the crossmember you will see the spots where the trans tunnel needs to be massaged with a hammer - not much, just a little, and no cutting of the floorpan need. There are also some rear pieces of the trans case that need to be cut off - they are there to mount the trans in a truck and are unneeded in a car.
I hope this helps - I have lots of pics, so PM me if you want more details.