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Happened to me with my first Pertronix in the first five minutes.
The ring is set up for stock specs but your 30+ year old dizzy cam lobes ain't stock anymore (any metal can be worn a bit even by the softest material if rubbed long enough, agree?). Shim with electrical tape...just a tiny little piece on one lobe...not easy to do (slip ring on without wrinkling or displacing the tape), but it is the solution...'least it worked for me.
Most people I advise to do this, don't. So, I won't feel bad...
Best,
Shayne.
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