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Use which ever one you want, for what your doing there won't be a nickel's worth of difference. My 408 made around 550 hp, there is no way I would've noticed any difference if it had been built on a 340 block. Build it and enjoy, 4" motors are a hoot.

For what he wants to do, performance difference based on bore size and crank journal size, just about un measureable. Does anyone know why Mopar went from a 340 block to a 360 block?

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