Box or rack, front or rear, you need to neuteralize the ackerman or return it to stock so the car feels stable.
To see how ackerman lays up in the steering system, you need to imagine looking down on the car from above, and drawing two lines angled from the pinion yoke though each lower ball joint and projecting forward.
For a rear steering system, the tie rod ends will need to have a narrower track than the ball joints to fall on the line drawn above.
For a front steering system, the tie rod ends will need to have a wider track width than the ball joints to also fall on the same line as above.
To have neuteral ackerman, the tie rod ends must be exactly the same track width as the ball joints and project a line straight back, not intersecting the pinion.