04 Silverado 4.3 to 4.8 Swap Need Help

[00_Silverado_Z71]

Also my buddy that's doing the swap works for gm and we located a part number for an 04 4.8 engine harness for a manual truck with drive by cable and with his discount I can get it pretty reasonable I may go that route to keep from having to buy so much extra stuff. Should all the sensors from the 2000 motor work on an 04 harness or will some have to be changed.

[GasGuzzler]

Not sure why no one mentioned but for how much work this is, please put a 6.0 in. The 4.3 V6 and 4.8 V8 have too similar power curves to make this worth the effort. ASSuming stock to stock engines with no mods you are gaining 20 HP and 10 TQ.