I have a 71 dart and it has been going through accel super stock coils the last one didn't make it 5 miles.i HAVE USED ONE OFF A FORD TO MAKE IT HOME ALL 3 TIMES IT HASN'T GONE BAD BUT IT IS EMBARRESSING TO KNOW IT IS A FORD COIL HOLDING UP
I recently had the same problem with my 65 Dart. I went to "Just Answer" and had exchange with a 28 year Dodge mechanic. After running wire direct from starter to coil and ballast resistor and this and that , nothing worked.
Put a multimeter on the terminals of the coil when running and check voltage. If it's anywhere near 12V, it's too much if it's the same system as in a 65.
I bought a new ballast resistor and ignition switch fron AutoZone and haven't had a problem since. I really think my problem was the ignition switch. PerTronics makes a coil that works with or without the resistor; part # 40011 for my 65-273-4bbl-auto. Good luck.