Neutral safety has nothing to do with spark
First check voltage at coil positive side with key on if voltage , remove distributor cap and open and close points with a screwdriver if no spark check for grounded wire from coil to points ie
Where the wire goes into distributor
Then make sure distributor is grounded to engine also remove points take sandpaper and sand where points mount to make sure they ground to dist
Then get an igniter kit and do away with points