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.