Tremec

I am told by Dederich's Motorsports that the TKX will fit in a B/E-body with not tunnel surgery. They could not confirm A-body fitment. That is who I bought my Tr-56 Magnum from.
Tremecs largest Elite distributor. They have everything you need except pedals and crossmember. You spend a lot more money if you buy a kit.
Tremec Transmissions - Dederichs Motorsports