Why is your distributor not firing on your amc 304?

Check your coil with an inline spark tester. If no spark to the distributor check for power to the coil. If power to the coil but no spark then coil is bad. If coil is sparking the problem is in the distributor. If no power to the coil trace back the wiring to the power source (battery voltage) Check the points to make sure they're gaped properly & not burned or corroded. Check cap & rotor while you're in there also. while the cap is off turn it over and check to see if the rotor (shaft) is turning.