[BarneyMobile]

Like Featherburner said, you'll be needing new pistons if you go with bigger crank. you can keep the rods. Its not about the bore size rather the placement of the wrist pin in piston. A longer stroke will require the wrist pin to be moved closer to top of the piston, other wise if you kept the same pistons for the 370 build, they would come up and out of the bore. The piston has to be selected based on rod lenght and crank throw.