The Bump steer depends on several parameters, the main ones, far ahead of all the others, are the position of the steering rack, in height and lengthwise, and on the position of the articulation point of the steering rods which must be located in the shot of the four triangle joints on the frame. What is true on one car, your '65 Shelby GT 350 for example, is therefore not necessarily true on another.
It is generally possible to reduce the bump steer by adjusting the position of the steering rack with shims.
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