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

67Dart273 said

SO............Try to check spark by using the KEY to crank. "RIG" a SOLID core wire to the coil tower (not radio resistor wire) and wire that to a test spark gap. Lisle makes a decent one that is adjustable, for about 10 bucks. You should get nice snappy blue spark at least 3/8" and more likely 1/2" long

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do you mean a spare spark plug wire and attached it to the tester ? how can i tell if its solid core ? i think what i have , one says magnetic suppression , and another says static suppression mag wire stainless steel on it , yet another just says double silicone 7 mm . how bad would these be for the test ? thanks .