Check compression.. check everything..
see if oversized rings are available. Most times they are. Maybe the cylinder can be honed to remove the scratches and new rings fitted.
before you spend a dime, determine the extent of the damage. Measure how badly the cylinder and piston are worn. New standard size rings may be all thats needed.. But if f the damage was caused by a lack of lubrication, all the bearing surfaces in the engine, from main bearings to connecting rod ends may also be trashed.