Can someone help decode this 12 bolt rearend, or direct me to a site that has the info. Hoping this rearend is for my 71 chevelle.

KDC 147 1
3969278NF
GM60
6 890
12345
A252


Thanks a bunch,
Kyle

72 A-body ,12 bolt ,born with 2.73 open ,built in Buffalo, N.Y. on 1st shift on Jan 25,1972.

Thank you very much. :)

Kyle