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Ford never quoted a figure in their manuals and it was suspiciously absent. In several early Ford manuals (like the 1941-1948 Ford Service manuals), the car specs were blank while some trucks had limits. In the 1949 - 1951 passenger car shop manual, with the arrival of Bendix brakes, Ford specified .060. The late Dick Spadaro offered this advice; use .060 for Bendix brakes and .090 for Lockheed brakes.
Now you will get a lot of people claiming state rules are at .060 but I have never seen any barner back up this claim with written evidence of a law. I had an aluminum GM brake drum that had .090 as the maximum diameter.