Depends on the Cam.. I've seen many LS2 3 bolt Cams and that's a Gen IV Engine..
If using the 3 bolt LQ4 Cam you need a Timing Gear like this..
View attachment 216312
These came factory in the later Gen III stuff, my 2006 6.0l that is in my SS had one in it. That will work with the Engine in that truck to put the LQ4 Cam in it.
As mentioned, look over the current Cam in it to see if any damage.
I've done a few, we had a procedure:
Valley Cover swap, or block off oil passages
Lifter Swap to LS7 Lifters, which now all the Non-AFM ones are that
Plug Relief Valve in Pan
New Red O-Ring on Oil Pickup Tube
Adjusted Tune in the PCM
We never swapped the Cam out because it had no damage, caught it early with just the Lifter tick.
Yea the LQ4 and LS6 Pumps are the same I beleive, I keep the spare LQ4 ones. One thing about the Oil Pump tho the pressure relief sping in the pump is 80# I think. Volume is absolutely no issue in the LS Engines, it is a good thing why I've never changed the AFM Pumps out and we never had issues.
I'm more awake now than I was earlier, hence more tech info here haha..