This turned out to be the exact OEM replacement for my 1999 Dodge Ram Van 3500 5.9L and works like a dream.
I had a bad intermittent misfire on my #6 cylinder preventing me from smogging van. That's gone now and is running a lot smoother and with a bit more power.
It's not an MSD DISTRIBUTOR, BUT WITH A HOT COIL IT ACTS LIKE ONE!