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This is a cool thread, good pictures and great writeup, thanks for posting.
I just wanted to add, that when you lap the valves, any bent-ness will show up real quick.
The carbon buildup could be from not having them adjusted and having them hang just a tiny bit open, scorched and blow by. It doesn't take much not-sealing-ness to loose compression, valves are real touchy that way.
I'm not positive, but in theory you might see excessive wear around the base circle of the camshaft from the follower riding it all the way around. That would be one indication the valves were hanging.
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