MSD - 6C vintage box

So at the Portland swap meet this weekend I picked up an old vintage MSD box with the MSD logo cast into the box like the anniversary 6AL boxes that they sold a few years back. This is an MSD - 6C box...C being for Chrysler! On the right side of the box is the male connector for a Chrysler 5 pin ignition box mounted right in the box. On the other end are separate power and ground wires. It seems that you could keep the factory wiring, hook up the power and ground cables and plug the thing in in place of the Mopar box. 40 years of fooling with Mopar cars, I have never seen such a thing.

Does anybody have any info on this?, ever used one or seen it used?

I'll try to post some pictures in a bit.