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Michael,
I'm running the Mallory HiFire IV ignition with a Mallory Promaster coil and Unilite Distributer. I'm also using Edlebrock heads and that is why there is a difference in the plug style. The RC12YC Champions are what Edlebrock recommends and the Autolite 3924 is a slightly hotter replacement for the RC12YC. These are both resistor plugs though, and since I don't have to worry about RF interference I'd like to try non-resistor plugs. I'd just like to be generating the best (stongest) spark possible and hopefully fire through fouling that might otherwise cause a misfire.
The fouling I've experienced is definitely caused by a "rich" fuel condition (moist black & sooty). I've gone the whole nine yards with vacuum tuning the idle & power valve circuits while also monitoring the mixture through the oxygen sensor.
Got it close but not perfect.
Steve
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