Key issues with my newly acquired 69 Barracuda

So rather than just talking about it I figured I'd take out the ignition switch and assess. That looks maybe a B-body ignition? The big nut was acting as a spacer to hold it in place.

Do I grind out the button on the cylinder and just replace that? Or do I replace the whole thing with maybe a 68 ignition?

Pardon my ignorance but I'm only a couple days into a car I don't know much about.

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