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The casting numbers show the first year that part was made, but often the same part gets used for a few years. If they made a 2V intake casting in '65, and didn't change the casting (which would change the part number) for a few years, then you can see why a "C5__" part number might be original on a block that was cast in 1967. The block part number and casting date are on the lower passenger side rear part of the block, roughly where the starter overhangs it.
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