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W/O question both heads should come off. Chances are both will have Significant amounts of corrosion on them that will need to be tig welded back up and decked back to spec. Valve guides/seats/seals etc need to be tended to as well. Any timing chain/tensioner and especially the upper guides that are 21 years old Need to be changed..as do the oil line clips for the oil feed tube on top of the cam towers.
Jonathan
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