Sorry for not responding sooner, I was looking at the pics on my little iphone's screen and couldn't see what was going on. ARD made several variants, and while that could be one they made, I think someone above hit the nail on the head when he suggested it's an old magneto type one, that someone's (quite skilfully) grafted a Bosch electronic distributor into.
Providing that it fits, it'll need a suitable coil, but shouldn't be too hard to time. One of the drawbacks of ARD's is that you couldn't adjust the ignition timing on the older ones, so were set at full advance, which is fine for a drag bike, but not so good on a street bike, especially if you were one of those "Kick start only" guys. Personally, I'd sell it, someone on Ebay will want it for his "Mancave/showbike" and pay you enough money to buy a Dyna 2000 setup, which will work way better.
You've just reminded me that I've got two Kawasaki Z1/KZ900/1000 ARD's here, I must sell them to pay for some recent bike purchases.
