Chris you can hone it to clear the scratches but as AVB says the hone will follow the shape of the worn bore. For what it is worth and probably the amount of work you are likely to give it, probably a hone,new rings and see how it goes. Problem is with a +20 piston you need to bore the barrel to suit the piston and get the correct bore clearance or you will find the piston will nip up in the bore (sieze)
