When you short the ballast, the five pin module is enjoying retirement elswhere, it lives on. The Pertronix or HEI is now doing proper dwell and current limits, so the coil is happy too.
And another way to put that is that you/he can unplug the old Mopar box and stick it in a box somewhere. (or save some poor sap on the side of the road that had a box fail) :-) That's where mine went, and he came back the next day for one of my HEI kits and got free installation.
Actually, you could even cut all those wires back to the harness if you want like I did.
I will make zero difference in anything else, and I personally will never go back to the OEM ignition anyway.
