Switched spindles and now there is interference

This isn't my vehicle, but a picture that i saved from the internet, from a site i don't remember.
It shows a 73-76 disc brake set up on a 65-72 sway bar tabbed lower control arm.
Don't know if this guy ran into the problem that your describing, or not.

What i would tell you to do is reverse that offending bolt, with the head on the outside, and the nut on the inside.
See if that works, and doesn't interfere with the inner surface of the rotor.