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So I drove over to the shop to get an alignment yesterday and when I turned the key off the engine didn't stop running. I tried a few times then just pulled the batt/tach plug off the distributor to shut it down. It does start so that kinda points to the switch maybe.
So I assume it might be the ignition switch on top of the steering column is broken or loose or the rack and pinion for the key cylinder.
I'm digging through Jim Shea's papers to find the steering column papers. I've managed to get all three papers using the way back machine.
Edit: I'm not finding anything in Jim Shea's papers about the ignition switch...
I have a 69, but the ignition switch is located in the same place. I think they even used the same switches for many years. If you lower the steering column, you should be able to get to the switch. It is a PITA because there might be several other things that have to be removed also, i.e. AC tubes. The switch comes with an alignment pin installed and you connect the rod from the mechanical switch and mount the new switch and fasten it in place. Once it fits in place then you remove the pin and pit it in a safe place in case you ever need it again. The Tilt column uses a different switch than the fixed column. Surprisingly, the switches are still fairly cheap. Test it before reinstalling everything to make sure all the alignment functions work correctly. You don't want to pull it apart again if you don't have to.