A855 - 5 Speed

People should just no longer buy them, it's that easy.

The Tremec T56 Magnum swap has been done enough times now -> just forget about ever returning the car to stock (you're not going to anyway), do the ToddRon crossmember and the T56 Magnum, proven stuff, liberty can face plate it, whatever you think you need. It's even the Chevy LS transmission so these will be around forever. Once you get the crossmember in and the floor figured out, the rest is frankly very easy.