I can’t remember the exact numbers anymore, but I recall a number like 54-1/2” flange to flange for early and 55-3/8” or so for late. Believe the change was made for Pontiac for the ‘67 model year… have also talked to folks that had a late ‘66 with the wider housing too. Wider housing came on 68-72 Chevelles and 69-72 GP amongst others.
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