I personally believe it was 2". Don't bet on that, it's just a guess. Do a search of the archives. I think there is a link to a site with a table of differential housing widths. Seems like BlackSunshine had a topic on this not too long ago.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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