1972 Dart Swinger won't start

I told you above, please re-read the post. Hook your meter to coil + Crank using the key, and read the voltage. Rig a spark tester as I said

If you have good voltage to the coil during cranking and no spark it is time to pull the cap and examine the points. Check the setting substitute another condenser.

See if the points are actually opening and closing. To do that put your multimeter or test light on coil NEG turn the key to "run" "Bump" the engine so the points are open and then closed. The light should go on and off as the points open/ close, or your meter should read from near zero to full battery voltage, around 12V

You can get a "quick idea" with just a screwdriver. "Rig" a spark gap in the coil tower. "Bump" the engine so the points are closed. Turn the key to run, and use a screwdriver to open the points. Every time you open/ close the points you should get a big "snap" spark from your test gap. With a lamp or meter on coil NEG the voltage should go from no lamp......near zero voltage witih points closed, to a bright lamp........voltage same as battery.....with the points open