Will this bore clean up, magnum head content too.

I'll get some hate, but I'd run it. It'll kinda clean itself up to a point.

No hate here, you are right. A ball hone if possible and let her rip. No it is not perfect, but should get a few more years out of it.

I would at the very least take that piston out, clean it up, and make sure the rings aren't stuck.