dansford,
I've removed the steering box from my '36 slantback several years ago. I did it in my garage with jack stands etc. I remember the only part that was kind of tight was getting the light switch rod high enough into the cabin to clear the steering column. It actually hit the head liner, but it did come out. If I remember correctly, getting the box off the column from under the car was not an issue. Hope this helps.
Snipe, U.S.N. retired