More details of the swap please!!
What exactly do you want to know?
LY6 and 6L90 transmission. I am going to use the driveline from the TCase on. The interior is going to remain the same. Exhaust will be custom. I am toying with the idea of running a couple of wires to the antenna buttons so I can do a individual gear selection. The harness I am getting help from a good friend (Toiyabe on this forum and others). We are going to combine the two harnesses.
Once the harness is done, and the engine is installed and hoses and all that are done it gets towed to an exhaust shop. From there to a shop that can flash the ECU. Then it should be driveable.
Ask away on what you are curious about, I will answer the questions as best I can.