I am a relatively new Model A owner, although I own a bunch 'a old cars, a Model T included, but the very first change I made to my car is take the white wall tires off, paint 'em black, and mount 'em inward. Now I don't look like a 76-year-old anymore when driving my car!
In my not so humble opinion, a Model A with white walls symbolizes a pretty boy, wearing a bow-tie and smelling the flowers, whereas a Model A with black wall tires symbolizes somebody like Steve McQueen.
I like white wall tires on certain cars, but absolutely not on any Model T or Model A.