As noted in my project journal I cut out the original cross member to clear the transmission and got my engine and transmission mounts located and installed.
I am still planning to rebuild the original cross member as a bolt in similar to what 52carl indicated although I think my transmission will require the center section to be moved further back and perhaps not as low. I noticed that the driver's side cross member is cracked when it is rivited to the frame so I will need to weld that in the process.