Leo Franchi and I just finished discussing your situation.I will ask my friend Leo Franchi, that engine and fuel management systems racing circuit guy I mentioned some time ago who evaluated my Base Sky last year. I will report back with his thoughts on this.
Leo says that considering your Sky has roughly 75,000 to 80,000 miles, and that a "brand new" GM manufactured (NOT remanufactured) head costs only $300, you are MUCH BETTER OFF replacing your original head with a new one, rather than spending money on your original head in machining, cleaning, and inspecting for cracks. He said your original head is roughly at half-life right now so getting a new head with new valves, guides & such is a big benefit.
He also said that you can safely without consequences, transfer the cams, adjusters and rockers, as long as the cam lobes do not show any sign of wear. If one cam lobe looks questionable, replace that cam.
Leo also said that a little oil seepage through the head gasket is considered normal after 20,000 miles from normal driving. Some engines seep a little, others don't, so don't fret over a little seepage.
Leo also emphasized using the right oil, most especially considering the turbo. Make sure to change the oil more frequently than specified. He says Mobile One is marginal for turbo applications. The turbo utilizes the engine oil and the turbo activates under moderate acceleration which is very frequently. There are better racing oils available for turbo applications. BUT I emphasis where Leo lives his life. To provide a snapshot of his thinking, Leo says the best racing oil is shot after just 300 miles on a race track.
In summary........buy that brand new head.