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where did you find a 65 440 ? first year was 66



It is most likely a 65 casting date block used in a 66 model year car.
I just had about a dozen 440 blocks from an estate of a friend's that I was selling off. I think about 6 of them were HP blocks. Some were still standard bore. About a week ago a guy came in and bought out the complete estate for one price. A lot of good stuff went out the door in one sweep.