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I checked my stamping last night and it is "3S" on the block, so I guess I have the rarest 427 in existence at 1 of none.
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These odd codes are very common on the canadian cars especially the full size for some reason.I have never been able to find a list to cross reference them like a IE or IH code but can assure you they were correct for some canadian cars.
Brothers 68 ss427 which has been documented by George has it's original born with engine which is stamped T01113T and it was a l-36 4spd. We also have in the pile somewhere a T01113S which we took out of a 68 pontiac 4spd.
Many of the canadian cars had these number /one letter codes but I don't know why.