Is that model number stamped on the case?
NO. It is on a tag under one of the bolts that attach the rear houseing. Sometimes it is on top of the trans on a white sticker. It is ofteh hard to read on the tag. It seems they get rusty before they start leaking oil. It is in the lower left corner of the tag. It always starts with 1352-xxx. There are websites that break down that number tells what the application was & the gear ratio's.
There is plenty of info on this website on the swap & a lot of fellow Stovebolters have done it & will help.