While I am not positive, the Pro Stock cars probably used a front mounted rack with reversed lower ball joints. That works fine in a straight line application, but it throws the Ackerman completely off. The inner tire needs to turn in farther than the outside. Reverse the lower ball joints and now the outer tire will turn in farther. If you modify the k-member to accept a rear mounted rack you will be unlikely to find an oil pan that will work, but you can always go to a dry sump or a custom oil pan. Then there's the problem of finding exactly the right rack that will not contribute to bump steer or other issues.
