The 10 o'clock notch sounds like it may have been to clear a bolt on bracket that supported the inner end of a clutch cross shaft. Bolt on brackets were used in about the same time frame as the bolt on motor mounts that the holes in the lower bellhousing area you mentioned earlier were used. Is there a spot adjacent to that 10 o'clock notch that looks flat where a bracket might have been positioned?
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John Brown
This isn't rocket surgery.....
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