1969-1970 12 bolt rearend

[1968 nova ss]

Guys,I am getting ready to list this 12 camaro rearend on ebay.i removed it from a 69 rs camaro in 1979.Just want to make sure I list it correctly;build date etc;any help out there .chris teed ;listings is as follows;BI 0806g1/ 3969341nf/ g259/gm66

[Mr70]

That's a BI 2:73 OPEN ratio,specifically for a 1969 Camaro built after August 6th,1969...1970 production began a three letter prefix.
Novas used this code too,but I think your late assembly date would exclude them.
The 69 camaro was assembled longer,treading into early 1970 production.