So far this PDF has the best overview I have come across using a Subaru Forrester rack, Celica inner tie rods and the Subaru outter tie rods, and almost match perfectly to the original dimensions of the rack on the 240z. The author also commented that he gets good road feel and it is fairly quick responding. Also, relatively inexpensive for about $200 if you already have a PS pump with the motor you are putting in the car. http://www.vikingds.com/zcarguy/Power%20Steering%20install.pdf