One of the case halves I have has a severly oblonged out Main bearing race from the bearing being severely worn out... I’ve seen it before where they were a loose press fit and could still be used with some minor work... but this one has probably .040in of play between the bearing and the race... is it possible to have someone machine the old race out and machine/install a new race? I’m pretty sure you could find the center of the hole from the crank seal bore... if anyone has any input (other than buy a set of cases) it would be greatly appreciated...