Throw in the snorkel conversions, too. They were done in the early to mid 50's when the GUPPY money ran low and they still had their deck guns. I think at least 20 boats had this conversion. Some were sold to foreign governments after snorkel or GUPPY mods, too. That GUPPY website posted in the other thread will help track each boat's history, though.
Other boats to consider:
Barracuda Class - 3 total (SSK Class), plus the modified USS Croaker (SSK-246)
Sailfish Class - 2 total
Grayback Class - 2 total
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