"...and there's enough overlap between the rotor's and distributor's contacts to allow for a lot of advance/retard, so a tooth off will not interfere with the secondary circuit's electrical pathway."

I disagree here, Professor. The rotor's contact is precisely engineered to cover the electronic spark timing range, and one tooth off on the I-shaft represents greater than 9 cam degrees (19 crank degrees) of error. Volvo supplies a plastic plug for the dizzy's slotted hole to prevent adjustment. We've solved other folks' trouble with misfire based on this error. Although it wasn't he case with Joseph's car, it wasn't a bad thought.

--
Art Benstein near Baltimore

If you lend someone $20 and never see that person again, it was probably worth it.