"That is my plan, pair it with my older OBDI PCM sharing most sensors."
Won't work. Has to be an engine processor at least used with an 8L90. Needs to speak in the right "language" across the CAN bus. It's not a simple matter of hooking up a few sensors.
"I note you say "The Chevrolet Performance crate 8 speed transmissions" so is there a non performance version??"
Chevrolet Performance being the only ones selling a "crate" 8L90 package. A service trans from the dealer won't have a harness or controller.
"Can you share more information on these Transmissions??"
Like what? They've been out a few years. Lots of info online about them.
This has some good info:
8 speed crate trans controller Instruction Sheet.
And you do realize the trans, a control kit, and an installation kit will run you about $7500, right? That's A LOT of gas. Heck, it'll probably buy you a decent van.