stroker engine balancing

I built a 408 stroker from a 5.9 L magnum engine. It has a Mopar 4" stroker crank with K1 rods and CP pistons. It was internally balanced and it did need mallory metal to achieve the balance. The piston CP # S4040 and weight is 455 gms. The K1 rod weight is 729 gms. So there is some combo of parts that do require extra weight. I don't know how the Mopar crank compares to other cranks for counterweights. Maybe the companies that sell the stroker kits can put together a set that doesn't need added weight. But I don't think that you can put parts in that will balance without doing the actual balancing operation.