Thanks for all responses.
This clutch only has 38,000 miles on it but am replacing it while ****** is out being rebuilt by VanPelt. The rivets that look like they have rubbed on the flywheel are actually still below the surface of the clutch although just barely. Don't know why they look like that. Flywheel bolts are the original. Don't have any washers under them.
I agree that it is most likely a combination of worn clutch and over-machined flywheel. Will definitely replace clutch and consider replacing flywheel.