I've mentioned this before, and have intended to get with the owner and try to get some photos, but around 1978, a young fella came to my house after purchasing a used '69 Camaro SS (396/auto).. Not a bad car for the time (just used). I had noticed the advertisement which the local Oldsmobile dealer had ran, showing a '69 Camaro tradein for $900, but elected NOT to go check it out.. When the young fellas came by and I checked out the car, I was extremely aggravated that I hadn't gone to check out the car, as when I checked it had the JL8 rear end!! I offered him more than he paid for the car to let me swap the rears (his car and mine), but he didn't do it.. and before I told him, he was totally unaware of the disk brake rear!...
The last time I called him (he still has the car) he was busy remodeling his house and the car was in storage; I really need to call him again and if I'm successful, I'll get lots of photos and detail.. (There's NO doubt in my mind that it was an original JL8 installation!)..