I am swapping my 5.3 for the 6.0 within the next 2 weeks from my 5.3.
I'll have a spare 5.3 with 50,000 miles and in great running condition with never a problem (ever) & has had Mobil 1 Synthetic since I first got it. (I am a loser and keep all the receipts to prove it)
I can provide VIN of my truck, etc. if needed.
Plus, you can feel free to come by and check it out and see how it runs before the swap in a couple weeks if you're in Houston area!

It will be a complete takeout minus steering pump, starter, water pump, etc. (the stuff on the front...lol)
It will, however, include the fan, the complete intake, etc.

How much is it worth....how much you wanna offer in other words?