2003 Silverado 4.3 to 4.8 or 5.3 engine swap

[cjcalhoun]

all 4.3 are drive by cable i also have a 03 short step reg cab also i was wondering about this to and also is the harness plug and play or do i have to change wires in the fuse box i can do anything with a carb but not so much with electical i understand the swap is straight forward just unshure of electrical also is a factory locker a good rearend i swaped one in my truck had the same gears 3:41 and disc brakes out of a suburban