The universal tires shown are 4 ply nylon. They will have a flat spot that you will feel untill you drive a little while and then they will smooth out. I have had 4 ply nylons on lots of older cars and it never bothered me but they were much larger and heavier than a Model A.
I believe that there were some previous threads that stated the polyester tires don't have this issues of temporary flat spots and also give a better ride. I can't say from experience since I too am looking to buy a set of tires and tubes.
I am leaning towards just biting the bullet and going with Goodyear for the look of the tread and ride. Still not sure. Let us know what you decide on.