1972 dart - stopped running while at 50 mph ? no warning

67Dart273 said
What does the spark at coil output look like? Is it good and blue and how long does it get?

Also, have you tried starting it with everything "normally" connected but with a jumper right to coil +?

Does the rotor look good? clean? Any sign of carbon through the middle to the shaft?

As clean as the cap / wiring looks I'm doubting that.

yes did try jumper to coil , same result , no start . rotor / cap look good to me , i didn't check the underside of the rotors shaft yet .