I am currently running the III with the correct III coil and Taylor 8MM Street Thunder Suppressor wires.

It appears to be just fine. I replaced a Mopar electronic ignition with gold box.

I like that it is all hidden with no extras harness short of the one extra wire from the dizzy. I heat shrinked them together so it looks like one at first glance. I took an extra ballast and opened the back and replaced the windings with a solid piece of #12 copper.(The Look I wanted was stock appearing)

Been running since late last year and other than having to re-curve the point type dizzy I decided to use, there have been no issues and as good or better than the old electronic. My plugs look better than they ever have.

Just make sure and use all the correct components recommended by Pertronix.