If you're having the car judged, I don't think you have much choice.
Otherwise, heck, they're only tires... an easy thing to change...
I have seen old pictures of all sorts of cars from the 1920's and '30's, some sporting whitewalls, and others with blackwalls.
I 've seen pictures of dozens of model T's with what appear to be 30x3 clincher tires with a narrow whitewall, like we had in the '60s...
White-sidewall tires certainly did exist in 1928-31, with high-end cars wearing double-sided WWW.
So, it's entirely possible that an original owner COULD have outfitted his/her A with WWW tires "back in the day", if that's how they wanted to spend their money...
Not all Ford owners were paupers...
Usually, I'm a "purist", at least on show-cars... but, with regard to my '28 Special Coupe, I'm having some difficulty coming to terms with the "official" factory color pallette.
As-is, my car is painted rattle-can black with red 21" wheels, and All-State WWW tires... ( guess that's a "1950's hot-rod" scheme?). None of that is "correct", but that's how the car came to me...
In my humble opinion, all the Ford body colors are too dark for my tastes ( would prefer a light yellow or blue), and black wheels & tires under black fenders & aprons is "just too much"...
Soooo.... I don't know what I'm going to do yet...
I'm definitely keeping the present WWW tires until they're worn-out... they snazz-up the car a bit, and I think help make it a little more visible to other (distracted) drivers.
I don't think I can live with black tires on black wheels.
For the rest of it... I think I'm leaning towards Dawn Grey Light for the body and Dawn Grey Dark for the belt/mouldings ( inverting Ford's "official" coupe scheme )... might keep the wheels red... we'll see...
SC Frank