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

AJ/FormS said

Did you index your rotor like I described?
Your ignition system could be 100% working correctly, but if the chain has jumped, it will be impossible to guess where your spark is going, other than to say it is not in the right place at the right time. The method I described only takes a couple of minutes and requires no tools.
If you have to move the distributor to align things, that guarantees something has changed inside the engine, and points straight to an out-of-phase cam.

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i have not done that one just yet , but i just now i , i just did the other test you described .

Turn the crank until the points are open. Near ground your coil-wire, .25inch should be good.
Find a small screwdriver with a small shank on it. remove the rotor. Turn the key to run.
Now short the backside of the point arm to the base plate, with a plunge and recoil action. That is to say, your screwdriver will be acting like the points. You should see a tiny spark on the screwdriver tip during the action, and a simultaneous spark at the near-grounded coilwire.

it DID get tiny sparks at the small screwdriver and tiny sparks at the near grounded .25inch coil wire . does that mean the five things that could be wrong if there was no tiny sparks you mentioned are all not wrong ?