You may want to look at universal tubular cross members for motor and trans, no welding. I have used them.
You need the whole front clip taken off at least. I seem to remember that disc brakes are difficult on torsion bar suspension. Power steering and brakes have many options, donor and aftermarket. Torsion bar suspension does create problems for some of that I think. Better study the internet for 60-62 swaps.
Generally power steering is mounting a box and hooking up to column with universal joints. Then plumb it up. That part is straight forward. The only difficult part is pitman arm and drag link.
Here are the cross members I speak of. Speedway Motors 91018212 for motor. 91628903 or 91628905 for trans. End caps 91618010
