63 Dart ignition issue
If you look in the rear of section 8 in the service manual, and find the area with ignition specs, they show the OEM coil numbers and ballast. The ballast value will NOT be legitimate if you are running a different coil
You can download them free, at MyMopar.com. Does not have to be the exact year. The older manuals were arranged a bit different and may not have it obviously listed. I think 66 or 67 was the first year of the "improved" service manual layout.
What do you have for an ignition system?