Please don't be too mad... I put a Harley part on my twin yesterday!
I actually found a Harley mechanic that was helpful to a lowly KZ rider (I think he has a KZ750 4cyl) that pointed me to a Screamin Eagle dual fire coil. It is the orange one ($5 cheaper than either red or black), ~3 ohm primary (seemed to float between 2.6 and 3). It was priced at 49.95, but I got a 15% discount because it was a display at one point, and they didn't have a box (I jokingly said it should be $10 off without a box) and they gave me the employee discount!
I cut the molded in mount off of the new coil and placed it in the tool tray under the seat because it is too big for the original location. Now I need a new place to put the hard case for my eye glasses!
I works very well, nice and smooth at almost all throttle positions, where before I had noticable miss, especially at low rpm (~2300) crusing. Now I think I can attempt to address some carb adjusting. Last year I cut my OEM coil apart and cleaned a very corroded pin that the plug wire pushed on to, and epoxied it back together. Next step is to make a ignitor for the KZ440 electronic pickup I have.