IF that's the only Piston with a Scored skirt (from what I can see) ,& there's no big lip or any lip on the bores other than Carbon, I'd just put in a good used or single NEW correct bore size Piston like a Silver light or Enginetech (rockauto.com no association with) & a fresh set of Ringings (if it wasn't using water prior teardown) Hone the Block , use cast rings or Chrome top if you might run it hot again.