Alignment change after changing from drum to disc

Like many of you, I’ve owned a few A body cars with 4 wheel drum brakes. Many of us convert to front discs, many times using the popular 1973-76 A body 11” discs. Throughout the years, I’ve noticed that every time I’ve made this switch, the front end alignment changes a LOT. Going from drum to disc meant the tires went toe OUT by a lot. The opposite happens when you pull discs from a car and put drums back on.
I had suspicions as to why but here is what I saw today.
76 Dart Sport that had...

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Author: Kern Dog