That’s interesting. Even with “too much” steering angle you’d think the tires would contact the frame first. Since they don’t that would mean the rack reduces the clearance to the rims compared to the stock steering.
I'm drawing a blank on what was interfering on my brother's car. Might be wheel to frame, not sure.
Since it is a front steer, I wonder of the steering arms are longer to help with Ackerman, thereby putting the rack further forward and resulting in the issue. Don't know, just spit balling.