Scoring may include both raised areas and pits or maybe just discoloring. Only the raised areas will cause trouble unless the individual pits are big areas.
Raised areas can be sanded off on both the crank and the cap. The bearing area of the block is probably scored similar to the area of the cap.
To sand the bearing area of the block with the crank in place, use double back tape and tape an appropriate thickness of paper towels onto the back of a strip of sandpaper that will apply pressure to the grit against the bearing area of the block. Sand and blow air until a new bearing will freely roll in place.
Use plastigage to make sure the new bearing has clearance.
Not much cost invested.