I have not checked your photbucket account yet as is it down right now. But I will.
On the chance that the Camaro is a JL8 I would highly recommend that you have your buddy take pictures of the features pointing towards JL8 include the trim tag and send them to Kurt Sonen. He has the resources to figure out these things and you never know it could lead to changing the time frame beyond 5E or it could lead to just someone putting in a JL8 rear end in the car at one time. You can reach Kurt at his email address:
More on Kurt and the crew at CRG here.
Trust me these guys know their Camaro’s.
All the best, Joe