Long story short, I'm quite sure my turbo is cooked and I have bought a used one off Ebay along with one of the newly designed oil feed lines. I should have them shortly, and the only piece of the puzzle that I'm missing is whether there are any gaskets or anything else I will need to do the job.
I know several people here have swapped out a turbo, but no one has given full details on the job. There is no GM dealership near me or any online resource I've been able to find, so any help would be greatly appreciated.