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Biggest reason that people use the 351W over the 351C - parts availability. There are quite a few parts for the 351W that are interchangable with the 302. There is a big aftermarket for 302 (5.0L) performance parts because of the popularity of the 5.0L Mustang. For example, there are a plethora of aftermarket cams and heads available for the 5.0L, and 5.0L cams and heads will work on a 351W.
Pete
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