[GRutter]

Don't pull the head. You have compression.
Do you see the amp meter deflect (slight discharge) as the engine turns over? That would at least indicate that the points are opening and closing (but timing could still be off)
If your problem started after changing the ignition switch I would start there.
Perhaps when changing the ignition switch, the ampmeter connection was disturbed.
If you don't see the amp meter deflecting, check points, then connect a jumper between the two terminal box terminals (bypasses the Amp Meter). You won't see amp meter deflection, but if the amp meter is bad it will allow everything to run.