The 429 and 460 share a 4.360 bore and a 6.605 rod but the 460 has a 3.85 stroke whare the 429 uses a 3.59 stroke. You are correct that the piston pin height is what's different between them.
Andy, did you have the bearings shipped directly to me? If so, I'll check the end play and then let you know. that way you don't have to drive out here for no reason.
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