1...2002 truck wiring and ecu
2...2002 truck cable throttle body
3...use the harness you have, you can remove whatever wires your not using, When my brother did mine, it was about 150 wires stock, when he was done it was down to about 60 wires.
car runs strong off the boost..the aluminum 5.3 is a 10 to 1 motor, so off the boost it runs great. not much lag, I have a 3000 stall so just when i come up to 3000 its making boost.