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From what I understand, Olds Cutlass 455 was not an option for 69. The only big block was the 400 which was an option for the 442. Most Cutlass owners did not want to spend the extra money on the big block option. The Cutlass Supreme was not a model line until 72. In 69, Cutlass S was the model line.
I would check the vin # to see if they are identical. More than likely that engine is not original. The 455 motor was available stock in the Delta 88.
Ron
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