You may have a first generation (67-69)camaro rear end.
You gave us the axle assembly stamp and it could decode as
PA = 3.08 ratio used in 67-69 10 bolt rear ends
11 = month (Nov)
27 = day of month
G = Detroit Gear and Axle plant
1 = 1st shift
To be more sure find the carrier casting number which would be 3894859 if I am right and then find the casting date code which
would end in 7, 8, or 9 if it is indeed a 1st gen Camaro axle.
All info I used taken from this site.
http://www.camaros.org/drivetrain.shtml#AxleCodes