distributor wiring?

While I was trying to carefully unplug all of the original wiring in my bracket car I cut both wires to my electronic distributor. I have an older MSD-6 box and am using a painless switch panel. I assume one of the wires goes to the MSD, but it is so old MSD doesn't show a wiring harness for it. I have one white wire coming from the harness in the MSD and another wire that plugs on the oppisite side of the MSD that I think is for the tach. Any ideas? The original wiring was so hacked up, I can't tell how the distributor was wired up. I'm also converting to a one wire alt. if that makes any difference.