67 c10 Ignition switch question

[Hawghauler]

So I'm thinking I don't like the key to coming out while the trucks running, and we all know trucks this age tend to have some serious key wear. So I buy me a new internal assembly with keys, and put my key in the ignition, get my paper clip ready and go to turn the key to the ACC position. Nothing. Try again, nothing. It turns to the right just fine, starts the truck fine, but I can't get it to turn in the other direction.
Did they do this different in 1967? I've done this before, but it was in a 1968. Am I doing something wrong?
So I think to myself, maybe they did it different in 1967. I jamb my paper clip into the assigned hole, key in the ignition, pull, nope. I turn it to the right, enough to turn stuff on but not enough to start the engine, pull and, nope. So I try it while starting the engine. Nope. So, I try to the left again and again, wiggle, jamb, twist, darn near break the key, and still no action.

Any clues what next?

Any help would be appreciated.