As for the 5.9 swap it was really straight forward...
you need a PCM from a 5.2 or 5.9.
Need to wire in 2 injectors to the PCM or buy a V8 harness
v6 motor mounts work
stock y pipe meets up
v6 tranny bolts up but may not last long.
Requires the use of externally balanced flywheel
If using 46re make sure to take the shifter linkage.
Need to buy v8 throttle cable as well.
Other then that drop and go