Balancing a Scat cast crank

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Can you use forged flattop pistons, H rods, and CAST crank with a 3.58" throw in a 340 block....and get away without balanceing anything, DONT want to pay if it's in the ball park. Would it be considered internal or external balance?
Just stop, please.
 
I just had my 408 Scat Crank balanced with Eagle H beam rods and Icon .030 over pistons .It took 4 slugs of mallory and 2 journals had to be drilled to take weight off. After learning hard way , motor in and severe vibration so motor back out and torn down again for balancing , go ahead and have it done before install
 
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