Did you get the vin number.
That will tell you first and foremost that this car is an aar.
Should read BS23JOB******
If you got the last numbers you can go on barry's site and see if the number appears anywhere on his lists.
You might get some more information on the car.
the last six numbers in the vin should be stamped on the passengers side, just above where the oil pan meets the engine. About half way back on the oil pan.
I can't remember where the one is for the tranny, I do believe it is kind of the same as the engine, passengers side, middle, at pan mount.
You can usually look underneath and see if there has been over spray on parts that were no over sprayed from factory.
Another give away is when you open the doors, you can usually see a paint color difference there as most folks don't jamb out when the do a quick repaint.
Make sure all numbers match, fender tag, vin tag, body number, radiator shroud number. Hopefully Build sheet!