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Open rearend is not too uncommon. All 65 Z-16 Chevelles had open 12 Bolts.
Mike
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I agree that it's not uncommon...but 57 purpose built drag cars, built all the the same color with open rearend seems odd.
Not being a 'Ford guy', did the factory figure that the rears/gears were going to be changed anyways, so why add the cost to the car and put a peg legger in there?
Mike