Toe-in changes when front end lifts at track

Does it come out of the water box straight? You can measure the lower ball joint grease zert to the rear axle on each side. Sometimes you can fine a 1/4 inch or more difference just in all the "lazy tolerances" of the car. I've seen some put spacer between the leaf mount and body on one side of the car to get the car to track true.
Thanks for posting this. In an earlier post I noted that my ‘65 Dart measured 3/16” shorter on the right side versus the left between the spring mounts. I only discovered this when I tried to use a fixture I had built to replace a section of sub-frame rail on the left on the right side. At first I thought I had made a serious mistake, but after checking, found out it was wrong from the factory on the right side. I had planned on making some kind of shim to go under the perch to correct this, but wasn’t sure that would be ok. Sounds like it is. Thanks again for posting this.