At this point in the disassembly, I'd remove ALL the valves, clean them, inspect them, and have them ground in a shop if at all doubtful. Not expensive.
Then I'd use valve grinding compound and lap them into their seats in the block. A shop would use the proper tools to contour the valve seats and control their width. I've never felt it necessary to have this done, or to buy the tools to do it. To see what would be required, do a Google on Goodson Tools - browsing their catalog is an education by itself!
Al
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