Rebuild the motor? Or replace?

[barkinfool]

A little surprised by many of the comments. I'm with G3 and fix the transmission & run the engine until there is evidence of an issue with the engine. You are posting this in the performance section, but you don't say this is a heavy track day car. If you are focused on the track, then it might make sense to ignore my comment. But based on your original note, no need to spend that kind of $$s at this point imo.