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A 400 SBC should have a externally balanced flywheel/flexplate and harmonic dampener. With that beign the case, you should be using a flexplate with sometype of weight on it. I would also just chekc to make sure you still ahve the motor as ext. balanced and check that you are using the correct harmonic balancer as well.
When i built my 383(w/ a true 400 crank) i had to use an older Impala 400 balancer and I had to get a weight welded to my T5 flywheel since i couldnt find a ext. balanced 153t flywheel for pre-86.
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