I need to have my 440 cast crank rotating assembly balanced because I am replacing rods and pistons.When balancing an externally balanced engine will the machine shop need the torque converter as well as the harmonic balancer and flex plate?Also, if this is done can I get rid of the external balance weights and treat it like a forged crank assembly?Does anyone have the specs on how out of balance the stock rotating cast assembly is supposed to be?Thanks...desperately need some good answers!