You would be better off to just pick a rack then design your suspension and chassis around it. The inner tie rod pivots relationship to the upper and lower control arm pivot points is very important for controlling bump steer.
Look here for a good explanation...
http://www.longacreracing.com/articles/art.asp?ARTID=13
I cannot stress anymore the importance of matching these points to build a good handling suspension. For my Bad Ast Project I started with a Corvette rack and redesigned all of the suspension points to work WITH that rack... Do your design this way and you will have no issues with bump steer.
Mark