Need Help With My First LS Swap

[Worldofhurts]

Hey Everyone, I Had questions about my first swap. I have a LQ4 6.0 with a 4L80E from a 2005 Silverado that will be going into my 67 Shortbed. Does anyone recommend a service that is reasonable to do the wiring harness and program.
Also this engine came with factor air condition pump and I was not sure if people use it when doing a swap or just use the one that comes in an aftermarket kit when adding air.
As far as some companies that program the computer on the internet I noticed they ask does it have air condition and I'm not sure what to say since I will be adding an after market air system.
Last question is what questions about my build should I be prepared to include to the companies that program such as tire size and such.

Sorry for the questions I just want the swap to go great and with as little issues since it's my first swap.