I did that to my 65 years ago. At that time I just went to the junk yard found one that would fit and swapped the case. I drove it for 5 more years. Probably should have checked 'runout' on the posi ring gear flange but didn't. Just what ever you buy try to find spare parts to have.I am swapping a 8.5 71 up rear now in my 67 Firebird. Why the 71, has better cruising gears as the 67 has 4.33's.The 8.5 is good and parts are available. 12 bolts are hard to find around here.
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