FWIW my preferred tool for checking voltage/signal at coil is a test light, check on the negative side, should light the light key on engine off not cranking.... Light should pulse while cranking... If it doesn't pulse the magnetic field created by the primary winding of the coil never collapse so the secondary electrical pulse (the spark) is never induced.. If the light lights you have voltage, if it pulses but no spark, coil is bad, which we are pretty sure isn't the case cause you've swapped it... No pulse could be ignition module which you've swapped, distributor signal which I consider suspect or wiring which could also be your issue.. That reluctor (the spiked metal piece in the distributor) looks crusty.... Unplug the small two wire connector at the distributor, take your meter, set it to millivolts probe those wires from the distributor while cranking you should see .9-1.4 millivolts.. If you do the look at the wiring if you don't swap the distributor..