90 degrees is a lot. More then can be...or should be.. adjusted with the tie rods. It is known that the steering linkage is almost never tight on the U-joint. If those are loose enough it can jump the splines and set the wheel way off. Better check...now. All the way down to the rack. To reset you will have to at least remove the upper section, use something like the string process to get the front wheels straight, then slip the top section back on with the wheel as straight as possible. Then make any small adjustments with the tie rods while setting the toe. I found 2-4/32" total toe is a good spot for these Zs.
Of course if you hit something look for something bent...like a tie rod or the rack.