Re: 6.0 engine replace. Pull Cab?
It is possible to fit the motor in without pulling the cab, but there will be a little "undressing" required. Take the turbo off the motor, and pull the front of the truck apart - radiator support, radiator, intercooler, condensor, grill, and other whatnot until you have a gaping maw to shove the motor through.
String your chain pretty tight, also, so you can fit the end of the cherry picker under the cowl when you get the motor most of the way in.