Jack the front front up to get the tires off the ground.
Turn the steering full right, then back full left.
Did you feel a tight spot dead center of the gear box?
Yes you did, start checking the rest of the steering and suspension.
No you did not, pull the draglink off the pitman arm so you can adjust the steering box without the rest of the steering moving.
See here for proper adjusting,
https://chevy.oldcarmanualproject.com/booklets/5220mts01.htm All gear boxes adjust the same way.
