You should still buy/borrow/rent a precision lapping plate and lap the head and deck with some good diamond paste. Make sure to keep the paste out of the oil and coolant passages and clean it all out of the cylinders.
And when I say you need to use a machinists straight edge to check that the block deck is within TSRM specs, I mean it. The tolerances need to be very tight to use any metal head gasket.
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