Disturb the head gasket as little as possible during the removal. It usually stays on the block but let it stay wherever it wants. Once the head is off, examination of the gasket frequently shows the source of the leak. Look for stains and/or corrosion that breach from a coolant passage to a cylinder or an oil passage. If you find a breach you found the problem.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer