Wow. That was some major repair work on the 100 block. Your lower picture looks like a 367825Rx block. R3 makes it newer than my book (9/64). With all the changes related to the water pump, I would be hesitant to try to backfit that block into a 100. It is doable, but I don't know what all you would have to change. To find the engine parts online, you may have to find a separate engine book for the C-123. Look for sections applicable to engine number 65,001 and above for the style of your second picture.
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