Swapping in the 2wd 'kick transmission is more pain than it is worth. You have driveline modification, transmission crossmember fabrication, transmission tunnel persuasion. In general there is little benefit. It is a stronger transmission, but not by a lot. The gearing is the same.
The flywheel is about an 1" larger diameter, 10 pounds heavier, with about 1/2" bigger clutch. Some benefit in that, but not necessarily worth the headache.
You are better off going through either Trailtough or Petroworks for your adaptor kit. Petroworks version sets the engine a little lower with completely new motor mounts and transmission mount bracket. Trailtough uses the stock Sammy mounts with adaptor brackets, but it is much cheaper and if your old mounts are good it's a better choice if you are planning on running an 8V 1.6.
