HEI Help!

[botboy]

Hi guys, helping a friend get together his 383 stroker for his '80 TTA upgrade (pulled the weak, pathetic, tired 301 that was NA even though its a turbo motor and the TH400 that went with it, dropping in a 383 stroker, eventually going to be blown, with a M21 4-speed and some real sticky tires on the posi rear)

Anyways, went to a junkyard the other day and he got a HEI distro from a late 70's GM truck with a 350 SBC. I can make out the standard wires that are the same as mine - the 3 that come from the position sensor and go to the coil, tach, positive from ignition, however, there is also another plug with 4 wires that went back thru the firewall. So he pulled that out too and it was hacked off so he couldn't find out where they went. We haven't tried testing it yet but at the same time don't want to burn it out. It came from a truck with a 4-bbl, so it wasn't an EFI truck. Where do these wires attach to, and will we be safe simply hooking up the positive and tachometer wires and leaving the rest alone?