Ignition sw on you get spark when opening the points by hand, but no spark at the points when cranking the engine?
put a volt meter on the distributor input and read it when you open and close the points by hand. Then read it while the engine cranks. If the voltage goes way down, take the same readings on the input side of the coil. Same thing? take the same readings at the hot side of the ignition switch.
If the voltage drops off at the dist. when cranking but is good going into the coil, you could have a 12V coil in a 6V system, or a wrong resistor.
