I have an opinion! I bet you will have to make a custom harness, mounts ect.
You probally can't reuse anything as all the 4.3L parts are more likely to be found on a 350 than a LS1. So I would say you will need:
A new radiator
a new fuelpump
power steering pump
AC compressor
Wireing harness
mount adapters
maybe a custom oil pan
headers
Like I stated this is an opinion but I bet someone has done this swap before. I used to scan the search engines and check every website I could to find potential problems when I did my research.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
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