What you have acquired is an older release of the current Revell USS Lionfish kit, boxed as Growler. The kit, in the ever popular 1/178 (or maybe 1/181, depending on who you read) scale was originally boxed as Flasher (Gato), then Growler (Gato) and finally boxed as Lionfish (incorrectly, as Lionfish was a Balao, with a quite different fairwater). They are all identical kits except for the decals!
The kit depicts (well, sort of...) a mid-war Gato class boat. Basically, depending on how crazy you want to get, there is a lot that needs attention to make an accurate fleet boat model. Also if you specifically want Growler, I have listed some references below on Navsource.
Ken Hart did an accurate update many years ago of Flasher, which was in the early SCR. I converted one to a Balao, to depict the late was USS Blenny back in the 1990's http://www.steelnavy.com/images/Dougherty/mod-324a.jpg
. That was done before the Nautilus conversion kits were available. (Nautilus resin conversions are at http://nautilusmodels.com/lionfish.htm
). Others have done similar work, such as Bob Cicconi's conversion http://www.steelnavy.com/RevellIcefishBC.htm
using the Nautilus Models resin conversions. Most recently, Rick Nelson published in both the SCR and in the IPMS Journal his work to improve the Revell kit accuracy. Reading or looking at the examples depict how daunting the work is to correct this kit.
Growler was modified several times during the war (see link below). As far as how to handle the limber holes; the limber holes on Growler were originally the Electric Boat D-shaped, half moon type. Several Gatos including Growler (but not all) received additional slot like limber holes to speed diving by allowing air below the deck superstructure to escape more efficiently. The "government plan" boats, built at Portsmouth NSY and Mare Island NSY had multiple rows of slots, and no D-shaped holes. If you open up the holes, you need some sort of false pressure hole, or else the light will shine right through the model, and look toy like. The fairwater also underwent changes as the war progressed. See the fleet sub evolution document below for some insights.
In addition to the resources Jeff mentioned, there is the following online:
general submarine information: http://www.navsource.org/archives/subidx.htm
Growler itself: http://www.navsource.org/archives/08/08215.htm
and this really valuable treatise on fleet sub evolution: http://navsource.org/archives/08/pdf/0829294.pdf
Frankly, even though it too has problems, the 1/144 scale Trumpeter Gato may be a better starting point. See: http://www.modelshipgallery.com/gallery/ss/ss-212/144-ph/ph-index.html
. Also new on the scene are some very good 1/350 scale fleet boat kits such as AFV kits, as seen here http://www.modelshipgallery.com/gallery/ss/ss-212/43-350-kk/kk-index.html
I would say build your Growler kit out of box for old times sake, and concentrate on things such as filling seams and fit. It is a major undertaking to try to get the kit into shape as a serious depiction of a WWII fleet submarine.