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Darrell,
You are making a false assumption that 351W heads are automatically better than 302 heads. In fact, stock 87-93 5.0L (302) Mustang heads flow better than stock 351W heads. You'd be better off getting some used 5.0L heads from a junkyard than using the 351W heads. Neither one will flow enough to support a 347 stroker.
Since nobody answered your earlier question, a 351W manifold will not fit on a 302.
Pete
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