When it comes to testing a device that generates a magnetic pulse, as long as the pick coil is not open, broken wire, then I would test those distributors with all the ignition hooked up, grounded well, and see if the coil sparks when you spin the distributor by hand
Did you calibrate your ohm meter before use? If not try that
If your ohm meter is not the type that you can calibrate the Ohm scale then see if you can beg, borrow or get one some how and retest those pickups