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In my brief Model A experience (1,800 miles) I had the same symptoms and didn't recognize them. I got stranded 30 miles from home and shelled out for a tow and several hours of modern mechanic time to find it was the condenser.
I immediately started carrying a spare condenser. Having heard how unreliable they are, and because my car came with a manifold heater which I've read can accelerate condenser failure from heat, I now carry two, plus the hand tools to change it out. They're small and cheap. I have a spare coil too, but so far I don't keep it in the car.
I've also had fuel issues from ethanol gook. So now I keep the fuel clean, add stabilizer over the winter storage, keep a log of when the car last ran and was stabilized, keep the points clean (220 sandpaper) and gapped. My start reliability has gone up and cranking time has gone down as a result.