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You won't know if it is a 429 or a 460 without checking the crankshaft stroke in some way. 3.590 for the 429, 3.850 for the 460. Everything else except for the crankshaft stroke and the pistons is the same. The 460 was in production much longer than the 429 so just going by the numbers it is most likely to be a 460.
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