The 351 would be faster as long as you slect the right heads/cam. It is much stronger then a 347 and will take more power.
go with the Windsor since the aftermarket has a lot more parts for it.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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