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I'd like to chime in here and second the use of CDI Ignition on these engines. Most of the COP coils shown here are Inductive with the Igniter built in. Work Ok on small chamber volumes where the Plug is centered and emissions is critcal. Not so great on these big chambers. COP Coils seem to be something that are considered but the real Ignition gains are often not understood. They do make it easy to fit with the Igniter built in and no more Distributor. If the Distributor is in good condition and a CDI unit of quality is used along with a good Coil, you will make more Torque this way than with Inductive COP Coils on these engines. This has been proven over and over. If multi coils are wanted, I suggest using a 6 Channel CDI of quality and 6 of the Mercury Ferritte Coils. They will need an HT lead down to the Plug but this can be short. If the engine is Twin Plugged, then you have to double up everything. If costs comes into it and you have 12 plugs, I would suggest 2 Single CDI boxes, 2 good Coils and stick with the twin headed Distributor. I do not suggest cheating the system by running 2 Coils off the same output. You just 1/2 the plug energy. It is exactly as its been stated, you get what you pay for. Cheat the system and it will show. Ignition is the most important part of any engine.
I have seen here that some of the CDI COP coils have been mentioned. The ND ones are good but hard to find now, new. As for the others mentioned, they have a poor reliability record, so beware.
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