That said, I am assuming that the orginal post was correct.
John made a comment below that perhaps there was still a timing difference in the TE-20 Lucus Electronics vs. the TO-20"s with AC Delco electronics.
I would thing the pistons could care less about what delevered the spark so long as it got there at the right time. That said I can perceive a differece between the Lucus & AC/D distributors in how they internally advance the timing. And thus the timing would be a little different.