balancing a 440

I have read that a cast crank 440 doesn't have enough weight in the counterbalances to balance internally. Is this an old wives tale or Internet myth? I just sent my 78 off to be balanced wnd had them order a harmonic damper and flex plate for it they used a weighted dqamper and flex plate and balanced everything with those pieces. I assumed this was proof of the story. Maybe the machine shop didn't know any better?

More info, reused reconditioned stock ly rods and KB hypers.