From the first group of pics, I don't see any garbage in the aluminum mix, no inclusions. I would suggest trying to drive out a guide to gauge the press on it. Doing the same with the seats will be more difficult. Looks like adequate material in the head bolt column. Only thing I see in the pics so far is any changes to the spring seat for larger, or more installed height should probably be done with diameter and valve length only. Looks like water is fairly close under the spring seats. Probably wouldn't risk cutting down more than .030" or so for clean-up. Keep up the good work.
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