You know the short turn is butchered and the cross section is all over the place. the valve seals were probably replaced at the track to make the last run on those heads at the end of the season.
As I said the short side was nicely polished and that was about it. He did the common gotta open “the pinch” and got very aggressive there. Common wall into the valve cover holes and way to much taken out of the gasket sealing common wall. There’s no reason in hell to thin that out that much. Someone read to many books or watched to many YouTube videos.