Mike, I just added the photo to the first post of this topic. Yesterday I removed the distributor and the cover of the block to see if there were more numbers, but there was no other than that (SO 627P). There isn't much info on the title either.
There should be a serial number on the title that either matches the Body/Chassis number or the Engine number, that's why I asked if that SO627P was on the title.
Bottom line is I believe it's a replacement 1954-55 235 engine cast in 1957 and those numbers could be from the shop that sold or installed the engine for their warranty records.
Mike B
