for the 00 and up 6.0s . . . . it's a 100% swap and go
takes about a day to do, I've done 3 so far
get a tune for the motor that you're going to run
get a trans cooler, servos, and a shift kit for the trans
a running 6.0 can be found for around 1,200
EVERYTHING SWAPS OVER
What do i need - a long block only! nothing else.
but what about my . . . . . will that swap over . . . ^^^ use the search up top.

 

yep, it can be done in a day to a day and a half if you have everything straight and ready to go, just remove and replace, nothing too difficult. If you've pulled a transmission then you already know about 1/2 of what it takes to get the motor out.

 

search for a thread by slowec he did the 4.8 to 6.0 swap in 8 hours.