steering issue

[hoovers71]

the po had a shop put on a new/rebuilt ps box from Napa. Now the issue is it won't turn as far to the left as the right, maybe 1/3 less.

Do I need to pull the pitman arm and recenter it on the shaft a few splines to the left? How do I go about this?

my thoughts are: put the wheels straight, pull mark the pitman arm and shaft, if the steering wheel is slightly off skew to the right, recenter it, put the pitman arm back on, it should be a spline or two, maybe three to the left. Is this correct thinking?

I doubt it is the box, but maybe it was built incorrectly. Are there many failed boxes like this?

TIA