Ditto what the others have said.
You may be pleasantly surprised.
Back in 2015 we pulled jugs on an O-320.
The engine was last overhauled in 1980 by Clydesdale.
It was 1200 SMOH, Chrome cylinders, and only flown about 10 hours per year for the last 5 or 6 years. The plane was kept in an open hangar down in Ohio (no door).
Two A&P's were present and to our surprise the surfaces were all mirror like.
Both A&P's said close it up and fly it to TBO. Don't mess with it.
400 hours later at 1600 SMOH she is still running well. Oil analysis shows normal for an engine of that age/hours.