Ignition switch contacts may disconnect if turned too far. That's not related to starting issue.
When it goes >CLICK< as you hit start button confirms that everything is working upstream, all interloc switches, all power-related switches. The only thing left that can possibly be problematic is:
- power wire from battery going to starter solenoid
- starter solenoid itself may have worn contacts internally
- power wire going out of starter solenoid to starter
- ground cable from battery to chassis
Might want to disconnect all these other cable ends that you haven't got to yet (all cables have 2 ends). Clean and lightly sand them and re-assemble.
Next time it goes >CLICK< without spinning starter, try bypassing starter solenoid by bridging its input & output terminals with needle-nose pliers. If this does spin starter, then we know for sure problem is with starter solenoid.
I'm just on other side of Bay from you (15-min past Sears Point Sonoma Raceway) if you want to come over. I've got spare cables & solenoids.