I have not tackled a box since high school , no cared if it even worked after I re-assembled it lOl
there is a ton of factors though , is the coupler loose
is the main shaft walking up & down in the steering box
What is the condition of tie rods ends & ball joints etc ?
What is the condition of the rubber bushings ?
How was the alignment set , all of these car were delivered with bias ply tires , the factory alignment specs do not work .
Any bent parts ?
The handling can be altered drastically with any of the above , if the steering box is worn I recommend swapping to a Firm Feel or Steer & Gear performance box