Stop in for a cup of coffee

Ok, another question for ya. This is on my own car, I was thinking of swapping the factory manual steering box to the PST 16:1 box. I do not have the factory steering wheel and if memory serves me right its only a 15" wheel. Do you guys think the 16:1 box would be a real pain in the *** at slower speeds, such as parking?
A bigger pain. Have your front end aligned with less caster if that's possible.