The pertronix II needs a special coil think it is a .6 ohm. and are supposed to run on 12VDC
On the second sheet
https://cdn.shopify.com/s/files/1/0247/6913/4628/files/91381A.pdf
Some one was in there before. When you change the bushings make sure you burnish them to lock them in to the case. Personally I would get another shaft. That is a weak point now.
That one is hard to find believe it is a one year only Roadrunner? The third pin is for a warning light, most have two and the dimple also is rare. I love this stuff.
If it has a real transistor on a heat sink instead of buried in the potting. We beat the hell out of it here
https://www.forabodiesonly.com/mopar/threads/1974-brain-box-saves-the-day.472657/