Would agree that the 1950 is original. Think your other block with C 248 on it is the same bore size without sleeves installed as a stock M block. Ones I find that have C 248 on block and a bore size without sleeves installed that is the same as C 264 or C 281 blocks are cast number 365586 R91, if not ground off. All of these I have noticed were cast in sixties, but since there not that common I'm not sure about start dates. Also found some replacement blocks with same cast number 365586 R1 but have cast size C 264 or C 281. Another thing that may point to a replacement block is a small flate plate on block near carburetor, held with 2 bolts. Hope this helps.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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