Tire size for easy steering

Well, I'm going to change my '69 Dart next year from manual to power steering.
After 2 major shoulder injuries, (one on each side) I tried to drive the car and enjoy it as is, but it's a pain to drive.(literally)
I have driven manual steering cars off and on all of my life including a '69 Super Bee and a '69 Coronet R/T with manual steering and it always sucked.
My vote is to change the car to power steering and never look back.
Forget all of the people who think it's ''manly'' to drive a manual steering car...

Nothing wrong with that man. I like the manual steering on my car, but there's a decent chance I'll install an EPAS unit under the dash and add a steering quickener at some point. I certainly don't run the manual steering to feel "manly", I just enjoy the heavier steering feel.

Same reason I drive my car all the time and don't worry about it being dirty or oily or putting a bunch of miles on it. For me it's about enjoying the car, not trying to get attention or an ego boost out of it.