[clay68c10]

It should have a 4x4 4L60E. You’ll need to swap to a 2wd tailshaft.
I don’t know the stock ratings, but the 5.3 in my Tahoe does ok and it’s a heavy vehicle.
You’ll want to get the engine harness, the gas pedal, the TAC module, all the accessories and the hoses too.
The only hard thing to get working is your mechanical speedometer. I think someone makes a tail housing with both a VSS and a cable drive.
I’m starting a 6.0/TKO swap into my 68 now, so I’ve been looking for the same info. It’s out there. The LS1 tech message board has some good info too.