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You would probably have to take off about .040" for about 10ccs.
At .040", you will almost certainly have to mill your intake manifold
you would have to cut a BUNCH off of the head in order to bring the 7.9:1 CR up to the 10.5:1 of the 1970 heads. and that would also require cuttingbob k. mando Today, 11:10 AM