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If you were to use the '57 and later flexplate with an old air-cooled fordomatic converter, I highly recommend getting the entire assembly balanced, since the more modern flexplate is foreign to the air-cooled converter. Also I would consider adding more shim rings between the back of crankshaft flange and the flexplate which will help to push the converter back closer to it's original position with respect to the transmission front pump. But not too many, because it will push the dogs of the converter hub into the back of the pump and grind the dogs to death. I would say not more than 3/16" shim thickness altogether more that what you originally had.