to start off with the conversion, if you are wanting to do a 5L swap, get a donor truck that already has a 5L AWD the same year as yours. that way everything should be just plug and play for the most part.
this is what you will need for a 5L conversion
the shopping list is
trans
motor
transfer case (unless you want to do a manual 4406, then you would need that case, and different drive shafts)
drive shafts
rad/condenser ***update, 4L SOHC rad/condenser will work***
a/c lines
power steering lines, and cooler
motor harness, and wiring from alt to battery ***update, 4L underhood body harness will mate to 5L motor harness, however, oil gauge wire, and a/c wires need to be modified to work***
throttle cable
trans shifter cable (not sure if i will need it, but hey) ***update, 5r55e cable will work***
air filter box ***update 4L SOHC box, and sensor will work***
exhaust from manifolds to muffler
fuel pump (not sure if needed but.....) ***update, 4L SOHC pump will work***
g.e.m.
p.a.t.s.
key ring around ignition cylinder, and ignition cylinder
computer
cruise motor with cable (or just cable)
evap lines