1990 c1500 5.3L - 6.2L and six speed auto swap

I have a 1990 C1500 regular cab short box truck I want to swap in a engine from 5.3 to 6.2 liter with a six speed automatic transmission to replace the 5.7 and 4 speed automatic that is in it now.

Has anyone done a swap with the six speed auto?

What will I need to do the swap other than the obvious engine transmission drive shaft computer and harness.

Is there somewhere I can get a computer and wiring harness pre made for a engine and transmission swap?

Any help will be appreciated.

Ya that conversion has been done before.
Nothing different about it as long as you keep it simple.
Meaning stick with the harness and ECM that is intended for that setup.

We make a harness and can provide the ECM programming.

Sounds like a good setup.