Update, May 30, etc. Pertronix working sweet(ly).
Earlier, I had no-go with the Pertronix installed. I had read that the timing might have to be advanced, so I advanced the timing a good chunk, and began to get some engine running, but not good. Things stunk. Poor driveability. No fun.
The other day, i fiddled with advancing the timing some more. I got 16 inches of vacuum instead of 5, but not yet good. Poor idling and acceleration.
I discovered that the distributor was stopped from turning further by an interference between the oil filler tube and the vacuum tubing to the vacuum advance mechanism. A little prying on the tubing, and the distributor was free to turn more (counterclockwise, of course). I hit the sweet spot, 20 inches of vacuum, good idling, good acceleration, fun again.
Never mind that the vibration damper shows extreme retarding. Damper rebuild for another day.