Assuming it is a 383 car other than options they were all pretty much the same regarding what was on the broadcast sheet with regards to build componants. Go to http://www.andy440.com/68facts.htm and look at the standard and optional equipment. These cars came with Rallye suspension standard and were available with a couple of different interiors. The upper door frame paint color MAY give you a clue to the original color of the interior.

Look for original color paint up under the package tray in the trunk and under the door panels. Look for the broadcast sheet under seats and under the dash behind the glove box.

The V.I.N. already tells you the model and engine. If it is a real 4 speed car there are telltale items such as the bracket welded to the frame for the clutch linkage and a firewall pedal brace.

Trying to research the ownership history is nearly impossible with the Privacy Act other than through previous owners.