We Have Ignition!
The engine has been running pretty well, but one item on the checklist that I should have verified before now is the point gap in the distributor.
First I verified that the distributor is indeed a Delco-Remy, model 622R. Based on that, the Service Manual calls for the gap to be set between 0.018″ and 0.024″. When I checked, the gap seemed a bit wide, and I reset to 0.020″ to be in the middle.
For now, I used a feeler gauge. When I find my dwell meter, I will verify the settings as I prefer using dwell. I will also be checking the timing. Nonetheless, the engine seems to tick over ever so slightly better as a result.