All the numbers do not have to match. LOL.
Example...Block Jan. 15, 1969, Heads, Jan. 22, Distributor, Jan. 8, Water pump, Dec. 15, 68 and so on. As long as the dates are a week or so up to 3 months before your car's build date, you have a numbers matching engine...especially if the last 6 digits of the VIN match the numbers on your block but this is not always the case, 71 455 H.O. is just one example.
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