So I still have no spark. I tested for voltage at the Hall unit
connector as directed. 10.5 volts, fine. I tested for fluctuating
voltage between the center connector (backprobed) of the Hall unit and
postive on the coil. Didn't seem to have any. So I put on a used
distributor. Now it has voltage, but still no spark. Probably it is the
same as the first distributor, and I just didn't probe deep enough the
first time.

Bottom line, no spark, no start, and all I did was change the
distributor cap.

Dan Fleming