[burner31]

Looks like it was fixed (welded) once before.
As for driving it. my gut feeling would be a big no.
You have two choices for pulling the unit, through the bottom or through the top.
Through the bottom you have to remove the steering wheel, floorboards and jack the car up.
Through the top disconnect everything from the steering box, remove the floorboards, brake and clutch pedals, and maybe the starter.
Others may have different suggestions, but to re-build my steering box this winter, I'll be going out through the top...most likely. (no steering wheel puller)