The 'traditional' steering box for that car would be 50's-early 60's Ford F100 as it will all but bolt up to the original steering box location - you have to mess with the holes in the frame some but it is a very close fit.
You'll about have to make your own fuel tank, there is space behind the rear spring pocket of the floor board (inside the car) where you can fit a good sized tank. theres lots of doner tanks but the problem is the filler neck as one will have to be made for it so you can fill the tank from outside the car - if you get a used tank you will be hard pressed to find somebody dumb enough to weld on it (i am an experienced welder so don't even try to tell me about filling them with water or sand etc). Don't think you can just have a cap on the tank and fill it inside the car - the pump hoses are now so short you probably won't reach the tank, remember?
Gotta love a Tudor model 'A', they make a great hot rod - how about apic or two?