GT40 heads would be a good improvement over the stock heads. Those are what are on the GEN 1 Lightning 351W's (93-95). BUT you need to change intakes, too. The best way would be to use the Cobra/GT40 351W upper/lower along with the heads. A cam change would be a good idea as well. Just remember your motor is speed density and not mass air.
I don't know the specs on a 96 351W cam. It'll probably depend on what it was in (ex: truck or van).
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1967 Mustang Coupe
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