5.3 to 6.0 swap questions Help!

Looks like I'm about to do the 6.0 swap but a few questions have come up after reading through more articles on the site..
1. I have a 99 5.3 and I've heard that I can swap out with any 6.0 from year 99-03.. Is this right?? Or should I go with a newer motor?
2. A NBS motor will bolt right up but a NNBS motor will not because of different cam shaft sensors.. Please explain??
3. My trans (60E) is being rebuilt as we speak and upgraded with a heavy duty shift kit. Should I stay with a 3000 stall?
Other than those questions I'm about to start.. Thanks