The tranny that comes with this 235 will be fine but will dictate that now you must go to open drive line. You could also stick with the 48 trans and 54 rear end if you drive like a normal person. But if your going to race the thing from stop light to stop light you're going to need a more beefy set up.
I'm in the final stages of my 47 Coupe rebuild; 235, stock trans, 3:55 gear in a '54 rear end. I keep telling myself I should have gone open drive line but now I'm in this thing much to far to turn back now. So I suggest you really think this through before you begin. Once you're stuck with 50 plus year old parts the rebuilding never ends.
