When I got my first a-body (1978) I was 5'10" (I'm still 5'10") and a whopping 125lbs dripping wet. I had no trouble driving the 66 Dart GT with manual steering and manual brakes (10" drums). My next one was a 66 Barracuda with a four speed and manual steering along with manual disc/drum brakes. My wife (all 5'3" of her) had no trouble with the manual drum brakes on our GTS convertible.

With that said, I am keeping the power steering in the GTS and my Barracuda convertible and we are adding it to my son's 67 Dart convertible. Half out of driving ease in parking lots and half because good manual gears are hard to find and expensive when you do.