The alignment condition or reference you are looking for is called "bump steer". It is an inherent condition on cars with rack and pinion steering.
Bump steer cannot be eliminated, only minimized by shimming the rack in the chassis so the steering links are leveled with the rack body. The intent is to minimize the self steering effect when the wheel or wheels hit a bump. The car wants to dart to one side of the road or the other.
A very good and simple procedure for checking and correcting for bump steer is in "prepare to win" by Carroll Smith. There may be some good explanations and procedures available with a google search.
Date: Fri, 13 Jan 2006 06:42:00 -0000
Subject: Steering rack shims (re-shim)
My car was jacked up using the steering rack support. Some damaged
occured that has been repaired. However i'm worried about the shims
may need to be re-adjusted for correct settings. I cannot find any
references on how to do this test and adjust. Can anyone give me the
procedure to test.
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