HELP- How can I tell if 727 is SB or BB?

This thread, from B bodies

Your 'Guide' to the 727/904 transmission

And from bangshift

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and if they are "unknown" don't forget the oddities, IHC/ AMC and I don't remember what all else. They made some sort of torqueflite for the US Postal American General "Jeeps" I think they bolted to an iron duke

Del, that top picture is backwards. The bottom one is right, though.