Scored cylinder wall

[road_king]

Hello,

I was in the process of replacing my cylinder head and gasket and noticed some scoring in a few places on the first cylinder wall. They feel pretty deep and you can catch your nail on them. The engine was supposedly recently rebuilt before I got the car; it's a diamond B block and has a counterbalanced crank. How should I proceed with this before I go any further and whats the cause? Thanks for help, I've included pics..