Worth it to balance rotating assembly?

If those 440 Magnums & Six Packs were poorly balanced from the factory, they sure went well & I do not recall owners complaining. They also seemed to last for tens of thousands of miles.....

As long as the owner matches the piston weights, in my opinion, the engine will be fine for it's intended use. If he did get the assy balanced, I doubt he would notice a before/after difference, except for a lighter wallet....