Could be from 1970 L-78 Camaro
 

My spare rear end.

My guess would be 1970 Z-28, but could be L-78 as well. Way more Z's built, so odds favor it came from Z-28. Either way a very desirable rear end.

With 8733 1970 z28s made opposed to 600 1970 L78 camaros made. I agree, most likely from a 70 z28. As stated its a very desirable rear end with the 70 camaro restoration people.

My brother's '70 Z28 had that rear end in it.

Welcome to board Boltupal, that would be odd but not impossible for either car L78 or Z28 - any 12 bolt for a 70 is hard to find but that's off the charts! wonder what happened to the car?