4.3 Swapp

[OhNoJoe]

Ok So against my better judgement I went to E-bay and got me a 4.3 inline 6 and tranny for $200. It has 50k on it and is complete with a wiring harness computer, mounts and all assecories i.e. power steering, starter, a/c compressor.
When I go pull this on Saturday, what else should I snag?

I know I'm out of my league with all this computer stuff but if I don't start now I'll never figure it out.......who knows maybe one day I'll firgure out how to pull a check engine code instead of asking the guys at auto-zone.

THanks for your input in advance.
Joe