Finally resolved the terrible hesitation on acceleration. New diaphragms in carb and adjusting carb mixture did not make it better, although turning mixture more lean did make it worse. Installed all new plug wires and distributor cap, no change. Installed new points, condenser, and rotor and runs great! Looking at old points they were not in very good shape, so we suspect this is the root cause. More fine tuning to be done, but it's very driveable now.
Found it interesting that the in line spark tester showed intermittent spark on #1 cylinder with old points. Continued same with new plug wires and cap. But now has a nice even spark cadence with new points. Also had difficulty getting timing light to fire with old points, but now fires fine with new points. Interesting observations to keep in mind for diagnosis challenges.
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