Aluminum head rebuilders in Portland Oregon is where I get mine done if I'm not assembling the head myself. Last one I did was for my 82 242 build, to have the head completely rebuilt with cam was $535 I believe. They will also ship the head rebuilt in a very nice and well packaged box.
I would de carbon the cylinder head face and check for cracks in cylinder head around the combustion inserts, also check the inserts for cracks. The cracks between the valves are normal as long as there not huge.
Check the flatness of the head and also check the cam journals to see if they are all in line (if the head was warped before and then cylinder head shaved to make flat again the cam will rock in its journals)
Hope that helps.
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