I know when I installed the original points replacement Ignitor II they told me to bypass the ballast resistor and run it with a full 12V.
The Ignitor I is different. That's the weird thing, I was running an Ignitor II in an stock disty and replaced it with a billet disty that also has an Ignitor II in it. I expected it to run at least the same with the adjustable advance features. I somehow lost a couple inches of mercury and it's not running as well.