I bought a older used KB top fuel 4.500 stroke crank with Mopar rod journals that is fully counterweighted, it had 4 cracks in it so I sent it to David at Marine Crankshafts (714-549-2388) to have them grind the cracks out and weld it back up and make it reusable. I'm going to use it in my new KB 4.500 bore wedge block to see if I can make 800+HP on pump gas with a set of B1 heads
On your deal how hard are you going to stress this new motor? More stress needs better parts