Mark, it would depend a lot on their history as the early coils were air cooled rather than sitting in an oil bath. As you know this allowed corrosion and moisture in and caused them to short out or the windings to breakdown. Having said that I’m running the original coil in my 26 Buick without a problem and have a couple of 1912 Cadillac coils that test perfectly, in terms of resistance so I expect them to work, once I get the car restored. So the good ones are out there and I’d follow Bloo’s advise and swap back to original.
To be honest I’ve had far more trouble with condensers than coils.