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All he needs if he's going to use a stock factory shortblock is a flexplate from a later model 360 magnum that has the weights on it, then he can run a "N" balanced converter,

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When the factory changed to a weighted flexplate they also changed to a symmetric 90° converter bolt pattern, the 727 and 904 converters have one drive lug offset so the newer flexplate won't work on the 904 without elongating one hole.

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With the weighted flexplate and a symmetric pattern, what stops you from mounting it in the wrong orientation??