How much did that 700 R4 trans and conversion cost you with conversion parts?
MrJLR, The unibody torsion bar crossmember that runs across the bottom of the car between the unibody frame rails does not have much clearance around the stock trans in an A-body.
Most overdrive 4 speed transmission are too big around that narrow crossmember area, including the bolt in A518 and A500 mopar small block transmissions.