I would just put your kit in the starter, doesn't take long. Put the armature in a drill press and while spinning the armature in the press dress the armature with 180 grit emery cloth until armature is bright. At the same time watch that armature is not warped (out of round). That scoring looks minor but you need to mic the cylinder to make sure it is in spec than hone cylinder. Replace the piston and rings.
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