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91's should have 6 bolt, if it has a 6 bolt engin rebuild that one.
if not find a 6bolt and rebuild that... other than that.. you SHOULD keyword SHOULD be fine just rebuilding the head.. replace all of the timing belt necesseties while you are at it if you decide just to go with head rebuild. ie: waterpump, pulleys tensioners... balance shaft belt etc etc..
-e
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