How wise/necessary to add power steering?

Welcome to FABO from the other side of State Line Rd!

I have no use for power steering in an A body. Unless you have some physical limitation as was mentioned above, you'll be fine. I even put a smaller steering wheel on mine and can maneuver in parking lots fine. Once the car breaks 10 mph you'll never notice the difference. I recently added a Firm Feel 20:1 ratio gear to my box, so we'll see how I feel about no power steering when I get it back on the road!