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I show CZ is a 2.73 10 bolt used 67-68 Chevelle.
1212 is rear assembly date Dec 12th
B is Buffalo axle plant.
The casting date will show the year. It is a small raised code on center section next to the cover opening at 5 or 7 O'clock position. Letter for month and numbers for
day and last digit of year. L87 for example is Dec 8th '67
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