The K10 diff came on the truck. That type of advice is exactly what I'm looking for. It's not a simple "weld in mounts, run plumbing, and run it" swap. It requires a lot of fabrication, which I have no experience in.
The engine runs, and as ot warms up, water begins to weep from the nearly block-long crack on the driver's side. As it reaches operating temp, it begins to smoke. Lightly at first and progressively worse.