I have a 67 440 that a rod let go and tore a big old divit in one rod journal. Thankfully it didn't hurt the block. I had another set of rods resized and the pistons hung on them. My question is, I have a cast 440 crank and I'm wondering if I can use it with the 67 pistons without a big difference in balance. I realize that the forged crank is internally balanced and the cast crank is externally balanced. I have both types of torque convertors. This is going in a truck and will probably never see 4500 rpm.