Track bar mount solutions?
 

Long story short, the bracket where my track bar connects to my frame no longer has a perfectly tapered hole due to a blow torch incident. Whoops.. It fits fairly snug, but comes loose enough to squeak every 400 miles. My theory is maybe it's compressing the slag left in the hole? My question is, do you think it will tighten up at some point and stay tightened or am I just better off pulling the bracket off and getting a junkyard one? So far I've tightened it 3 times.

No

Not likely that it ever will ever do so.

Even when they're not damaged they can get sloppy and move. Just get one at the junkyard or get an aftermarket setup.