if you are talking about a bigblock crank it wont fit. try this 400 block 350 crank 6inch rods, if more cubes is what you want there are aftermarket cranks at 4in, with a 030 bore job you will get 434 cu in, but use longer rods than 5.4 those rods are shorter than stock 400 rods which are too short to begin with and don't bore the 400 block any more than 030 and fill it with hardblock(partial fill for street)
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