I have 225-60-14s on the front of my SB '67 with a 16:1 box. Turning the wheel when completely stopped is a bit tough, but not unbearable. If you're moving, even slowly, it's not a problem. You get used to it. I also enjoy the tightness of the ratio.
My brother has 225-60-15s on the front of his BB '69 with a 16:1 box. Same situation as mine. As long as you're moving you'll be OK. Only when you are stopped while turning is more effort required.
Both vehicles were originally equipped with power steering. We converted them and kept the 16:1 boxes.