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Thanks for the help. I finished disassembly today. The only thing damaged were a couple valves, one, I cut the stem, and the other, I used a vice grip on the head to break it loose. Once all the tappets were tapped aside, I used the cam nut tool and a breaker bar. Now I have a bare block to check for any problems. Tappets came out with no real problems.
The new cam nut tool would not fit over either the original cam nut, or a new nut I bought at the same time. It took a field modification to get the thing to fit. Whoever made the tool had a few wiggles in their cutting, and did not check it for a functioning hole.