The swivel seat brackets that are available here on this forum WILL clear the NV271 t-case lever with the U-JOINT conversion. Checked on that before ordering either and both worked together. Check the swivel seat thread.Manual t-case definitely has that advantage Pat. However, for the vans, it's a bit in the way if you want to install a driver side swivel. So going with the elec NV273 t-case solves the swivel, but then you lose the "feel."
Hope all is well down in FL!