I was board one day so I checked continuity on all the pins of an ignition switch, The switch is reported to be a 67-69 dash mounted Dart compatible switch.
An "X" means the pin to itself
The green highlight indicated continuity
"Open" means no continuity
"Closed" means continuity
There is a GND tab but it is open to all pins and the housing of the switch as well.
ING 1 and ING 2 appear to be a "Make before Break" type switch as there is some continuity between them in a particular position between full start position and the full run position
All tests are between the pin in question and all other pins