The 351 is going to be heavier than the 347, and therefore slower (in the short run). But if you get some money in a year or two you can still stroke the 351, the 347 is already maxed out. If your on a tight budget you might want to stick with the 347 because you wont have the added cost of converting. What kind of power are you trying to make, it might be easier to answer your question if we knew exactly how fast you want to go.
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