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Do not think it has been mentioned in this string. The points block is grounded through the distributor body via the lower plate screws. The distributor body is grounded via sitting on head, the ignition armored cable and cable clamp to the head/stud. and the distributor holding screw holding the distributor stationary.
So clean/remove paint from the distributor body where the lower plate mounts. Remove paint/clean the bottom of the distributor that sits on the head and remove paint/clean on the head where the distributor sits. Make sure the distributor body threads the ignition cable screw into are clean and paint free. Insure the ignition cable clamp is paint free/clean where it sits on the head and clean/paint free on the clamp where it clamps the ignition cable.
I had issues with a new rebuilt distributor that the bottom , ignition cable threads, and plate mounting holes/mounting bosses had not been masked and therefore painted. It would run somewhat OK at med/higher revs, but missed at lower revs. My theory is the grounds were punching through the paint when the generator raised the battery voltage, but weakened at lower revs.