Is overspray on cylinder head ok?

Maybe

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But TBH in the photos the cam and lifters look used.
That, and the pushrods looking mismatched. And someone said earlier run it? I don't hardly think so. With the way it looks I would pull the heads, oil pan and inspect everything, oil pump too. The more that's been found wrong with just going by the photos, I think it's a painted over used engine. I think that I would replace everything.