[RSTarga]

You can probably just do a top end rebuild. Bottom end should still be strong with that mileage.
You don't want to drive it like that because the cylinder will rub against the block and damage the seating, you'll then have to do a complete teardown.
It'll run from 6-10k depending on the shop and what needs to be done. If you don't have a good Porsche shop around , it might be better to ship the engine back to a good shop in California.