B E rear in my 68 that I just bought!

[1goug76]

Ok the rear is in the car of course so I cant get real good pics, but I will try this wknd. For now here are the numbers: axle tube, B E 0513g1 then of course the E underneath for eaton. The ring gear number: 1 gm 39162261041569 and the number on the pinion gear: 693916228 41gm. like I said everything is in really good shape inside and it doesn't look like it was ever torn down. If this isn't a copo rear don't beat me up too bad I am a newbie with these cars. and I would also like to know what numbers if any I could check on my trans it is a m21 and I think it is a close ratio( it feels like the close ratio in my uncles gto fast shifting through third then fourth seems alot higher) the reason I asked is the guy I got the car from said the previous owner told him the guy he got it from put the rear and tranny in it from an old camaro that was going to be junked. Who knows I may have a tranny too! oh yea what is this thing really worth, not what people are asking and not getting, but real world money?