In the next month or two I will start gathering parts for a 5.3 or 6.0 swap, probably a 5.3 for mileage reasons. This will be in a 99 2dr 2wd Tahoe.

From what I understand, I need.....
MAF, complete engine, computer, motor mounts, and I plan on using the Nelson harness. Is that really it?

Do I need the harness from the donor? what about O2 sensors, can I use the ones I already have?

A/C I can do without right now(been through 4 texas summers without it)

I know I'll have to have alot of little stuff, but what would be things I could buy in advance? I have done a lot of research and it just seems I am missing something when I run it through my head.
I know the donor computer will need a tune, right? What about the factory Tahoe one?

I'll be going to E-fans, and getting the 60e rebuilt. Might install some good heads and mild cam before the swap.

Thanks for the help guys.