I would have a shop measure and clean the head. I just took mine off to clean up the valves and put new valve stem seals on. Luckily, all my valves, stems and springs were within specifications, the valves seated great,and did not need replacement. The head was flat too, but it's worth getting it inspected and getting the valve stem seals replacement.

Do you know how long it was since your timing chain was replaced? Have a look at the guide and see it has been chewed up. If it is and your timing chain cover is gouged, you may want to pull your oil pan while you are in there.