Do you have a pict of the cross member you speak of?
It would need to be a home-brewed setup. Most people do not use the front "bird leg" mounts when swapping to a modern automatic, but they usually have the option of using the side mounts on the later-model block with an aftermarket crossmember which pretty much balances the engine in the middle. The metal butcher who cobbled up that rear mount should be slid down a 50-foot razor blade into a barrel of alcohol- - - -that's a nasty looking mess!
Jerry