Check here:
http://www.camaros.org/drivetrain.shtml#RearAxleNumbersBP in '67: 3.08:1, 10 bolt, non posi rear axle assembly
0117: Axle assembly date, i.e. January 17 (1969? see below with regard to the housing casting date)
G: Detroit Gear and Axle Plant
2: Second shift
B7890 (should be 67890) and 345 are test marks
A 8 9 is the casting date.
A = January
8 = day
9 = year, i.e. 1969
The casting date would indicate that the axle assembly is not a '67 axle but rather a 1969 assembly with housing casting date of Jan 8, 1969. BP in 1969 was a 2.73:1, 10 bolt, non posi rear end.