The real question should be: How big are your arms? or Did you want to build up your upper arm strength? The steering wheel will be hard to turn at slow speeds but should not be unbearable unless your have a big block. The I'd advise changing to the manual ratio 19:1.
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.
16:1 isn't hard. And take it from me, yoiu sure don't want the 19:1 steering. You've darn near have to turn the wheel twice just to change lanes. I let a brother in law drive my 19:1 car once and when he pulled out into traffic he made a long slow S across the lane before he finally got centered. Just because things were happening so slow for him. They also really put the panic intoi panic manuevers.