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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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Forgot about mentioning that too (i useally do), but still its a no brainer really, longgate the one hole & walla!! I ended up enlarging the holes on mine to exept the 7/16" bolts for my PTC, worked out great