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It sounds like maybe you had a 12 V (3 ohm) coil?
I've had 2 coils fail on me over the years, not on Model A's. One was a '69 Ford 1/2 ton w/a 302, driving one day and the truck backfired and snorted a couple of times and settled down and ran fine. 2 or 3 years and many miles later it started running not quite right, felt like it was a carburation problem, disassembled, cleaned and checked over the carburetor and all was good. Truck still didn't run quite right. Cleaned and re-gapped spark plugs and truck ran good for a day or 2 and then started acting up again. Talked to an old timer friend and he said "it's your coil". So I replaced the coil and problem solved.
The other time a coil failed was on a '89 Ford Bronco w/a 351, it just quit and that was it. I was on my way to work and a work mate stopped and gave me a hand to push the car around the corner onto a side street for later retrieval.