i just got one out of a 250 that was in a 1980 chevy c10. I also grabbed a spare cap, rotor, ignition module and coil (basically second distributor while i was there. The distributor itself was only $20. And there where quite a few left, plus they also get new vehicles in by the truck loads everyday so there are plenty where that came from.

My truck already has an alternator and im currently rewiring the truck completely, and already have the 12 gauge wire marked in my wiring diagram that i came up with. I have it going from my ignition switch to the fuse block where it goes to a 30amp fuse just for the ignition coil and then out to the distributor. All 12 gauge wire.