Rod Crank Balance Questions

Ok, This is not a small block I need help on but there is not a big block question heading. I am doing a somewhat budget build on a late 70,s 440. Engine first had a cast crank with LY rods, externaly balanced. Found a Forged 440 Crank that I would rather run instead(of course). Yes I have the harmonic balancer for the forged crank, but this forged crank had the 6 pak or heavier rods in it. Question is am I going to have to get all of it balanced which means taking pistons back off of the rods ( which is risky). Anyone else ever gone thru this?