Pertronix install vs. wiring diagram

Well what you just describe IS the definition of "rotor phasing."

If phasing is correct otherwise, changing the mechanical advance as it rotates cannot change phasing, because the rotor and the points cam move together.

But vacuum advance and the position of the points (Pertronix) is a different matter.

You MAY have an issue

If you do not want to check this, file this away in the back of your mind. In a few months, look in the cap and rotor, and see if you can detect any "carbon tracking" on either side of the contacts in the cap.