I've seen this boats name come up a number of times so there has to be some information out there.
This site has a pic of the boat with a flange for the gun at the rear but not the front, doesn't say what year.
Listed on the Bowfin site.
USS Tautog (SS-199) - Moored port side to south side of pier No. 2, Submarine Base, Pearl Harbor, T. H.
History.Nav.Mil
USS Tautog (SS-199) at rest, probably off New London, Connecticut, at the time of her completion in 1940. She is painted black, with large numerals ("199") on her conning tower side, and is fitted with a 3"/50 deck gun aft.
Starboard quarter surface view.
Might want to look around SubCommittee if you haven't already.
Floating Drydock may have something of use to you.
Interesting bit of info.
During the second wave of the attack, the USS Tautog is credited with being the first US submarine to single-handedly bring down a Japanese aircraft in WWII.
I believe this actual gun is now aboard the USS Pampanito in San Francisco.
Eric...