Cam swap without pulling motor

I was told by the seller that the motor in the truck had only a few hundred miles on a fresh rebuild. I was skeptical, but I have not found anything to dispute the claim. Pistons are 0.030 over. There is no ridge at the top of the bores other than a few places I can feel the slightest amount of carbon. Zero sludge anywhere.

Look at the pictures of the CC. What can you guys tell me about the tuning job?

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