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Casting number is for a '65-'66 396 4-bolt block.
EF SUFFIX:
EF 1966 396 360 Chevelle HP
EF 1967 396 350 Chevelle HP
EF 1968 396 350 Chevelle HP
A casting date in '65 doesn't necessarily mean it went into a '65 vehicle- it could have been used in '66, depending on the month. In the case of an "11", it would indicate your block was cast in November, and would not have been installed in a '65 vehicle.
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