that scuffing could have been from initial fire up - as in lack of oil on the skirts and possibly honing grit left in the bores. I would re-hone it and scuff the pistons skirts with a scotch brite and stick it back together. How did the bearings look that will give you an indication of a dirty assembly
More debri in the bearings than I would like to see for what is supposed to fresh.. Pan was spotless.
So I can only assume the pan has been off and cleaned.
Possibly too dry on start.
I can imagine a scenario where the cyl.s were washed down,from sticking floats,timing wasn`t right or ignition. Cranked it forever over who knows how many attempts/days before actually getting it running..
It is getting honed,fresh bearings/rings and back together.
Cheap insurance versus damaging a new block and assembly.
