rearend alingment HELP!!!!!

If the car has a rear seat bottom you wouldn't even need a tape measure to see the offset. The hump isn't in the center and where it runs under the rear seat shows it. Atleast 3 degrees and no more than 7 degrees in drive line is recommended . It's about universal joint life and nothing more. For weight distribution a centered chunk might be better but wheelbase length would need to be very short.
I'd love to be there with a protractor and a string. To find it within tolerence just on the opposing side of center would make your day. :)
Good luck