I am now confused...I am doing this upgrade as we speak on my 91 waggy. I was just going to wire the new connector just like my old connector. They are both a two wire, one positive, one neg. Are you saying I should not do that???Let me state up front that both TZ & I bleed Ford Blue.
There are a couple things right and wrong, IMO, with the article.
The first thing is to just start out using that TFI coil. It is worth it. Get the bracket with the coil. I used a junkyard sourced coil (& module) on my '67 Ranchero for nearly 10 years prior to my selling the car.
The second thing is that in my very first D-S II conversion (about 1987 & on a 300ci 6 in a '66 Econoline Van) I ran the module off the stock ign supply wire, so it ran just fine on ~9 volts, not the 12 volts that the author claims is critical. I would wire to 12 volts, but don't sweat it.
If you can by any means avoid cutting the mag trigger wires, do so. The maximum voltage generated by that trigger coil is ~1 volt, so any resistance in the wires is a problem. Unlike the article's author I do not solder wires except in rare instances. It is too easy to cause yourself more problems than you thought that you fixed by soldering.
On that '67 Ranchero of mine I tried an MSD 6 in place of the stock module. I even went to the trouble of making up a wiring harness that let me easily swap them back and forth (not easy, there's a wire that has to change it's connection location). This was with a medium compression ratio 302 ci with a mild cam. Other than cold start idling (no choke) there was no detectable difference in the way the car ran. I wouldn't bother. One of the IH conversions that I made in 1990 used a JY sourced module for the 4 years that it drove around here, and for all that I know it may still be using it in Alaska. The OE modules, not those in the parts stores, are really that good.
So, JY shopping list:
D-S II Distributor to fit your engine
Large Cap Adapter
OE Module with Blue plastic wire strain relief
Wiring from distributor to module (within the blue strain relief modules any will work - shop for the one that closest matches your length needs)
Plug off donor car wire loom for ignition power (cut as long as possible)
TFI coil & bracket
TFI plug (note that the wire loom from the dist. to the module has a green wire that goes to the coil negative, if the TFI plug donor is the same as the dist. to module loom donor don't cut this wire)
While you're in the JY plug in everything that plugs together to check that you have all compatible parts. The plug shapes and key locations change with the different color strain reliefs, and most JY's won't take back wrong electrical parts.