you would want to find a donor truck the same year as yours that has a v8 in it already and swap everything over from it. in the long run that is the easiest and cheapest way to go.
as for parts
trans
motor
transfer case
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 ***update, 5r55e cable will work***
air filter box ***update 4L SOHC box, and sensor will work***
exhaust
fuel pump (not sure if needed but.....) ***update, 4L SOHC pump will work***
g.e.m.
p.a.t.s. if yours has it
key ring around ignition cylinder, and ignition cylinder
computer
cruise motor with cable
evap lines
