Well, I tried to transfer over my MO1 internals to this M1 case but one mounting bolt was off so up it goes.
Pretty clean case, freshly polished crankcase. The ignition area still could use some cleaning. All of the bearing lands and seal lands are in good shape.
Your MO1 internals will transfer right over with no modification. Just make sure your lower rear mount will take the 60mm bolt and not the 32mm.
I will throw in the reed cage and intake.