bk....,
1. The Black "Ultimate Coil" is more forgiving of running with one plug disconnected. If you catch it quickly, you will probably get away with it once or twice.
2. The "Green Monster" coil is absolutely unforgiving and will fry on the very first pulse with one plug wire disconnected.
3. The Ultimate coil is smaller and easier to install.
4. The Ultimate coil will continue to produce 82,000 at higher RPM's with the 60 degree dwell angle of the PAMCO. The green monster starts to fade at around 5,000 RPM, but we are talking fading from 75,000 Volts, so the output is still good up to red line. The Ultimate coil will still produce a usable output up to 10,000 or 12,000 RPM.
5. The green monster has a higher primary resistance, so it can also be used with points.
I have run both from time to time in my "81/H and my '78/E. I am currently running the Ultimate coil and I just like it better for the above reasons. I have also installed two of the Ultimate coils in my '74 CB750 to go along with my new CB750 ignition system and it really wakes up that engine. (
www.cb750ignition.com )
If you go ahead with the PM alternator, I would suggest that you initially connect the PAMCO and coil to an independent external battery when you first start it up because there have been a few cases where the PM alternator produced a very high (20 Volts +) output on initial startup and fried the PAMCO. After you have verified that the regulator on the PM is working properly with 14.5 volts, then go ahead and connect the PAMCO to the bikes electrical system. I also suggest that you wear safety goggles for the initial startup because the potential for a very high voltage can cause the battery to boil over violently and / or cause the capacitor to explode if you are going without a battery.