Oh man..It seems I've just confused some people as much as I'm confused.
I was talking about my duster. Its the only slant six car I own but I should have specified. Truth be told I really don't know a lot about engines. The Duster and the Charger are mine. I'm rebuilding a 440 for the charger and working on the slant for the duster at the same time. This is my first experience at engines so I'm learning as I go. The rest of the cars are my dad's and we have never done any engine work on them so this is all newer to me.
Back to the matter at hand. If I got this right I Ignitor II would do me no good but a Flame thrower coil and good cables will help out?

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73 440 Charger
75 225 Duster

They won't hurt!

Here's a thread with some more recommendations for IGNITION PARTS.

I've heard good things about the Flamethrower coil, and the MSD Blaster 2. I've used an Accel Superstock coil for way too long ...

Your '75 probably uses the "peanut" spark plugs, somewhat limiting your choice of plug.

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO