I once had a Hemi car whose bellhousing area looked like someone had shot it with a shotgun from underneath.
Its early life was spent street racing and maybe some track racing (there was a log kept on the car).
It got a Lakewood housing & quality clutch stuff, and a rev-limiter, when I restored it to its period Day2 engine/drivetrain specs.
But for my stuff that just gets cruised, I just don't like seeing cracks or heavy heat damage; they'll get new OEM-quality stuff.