You need to look at the VIN located on a metal tag on the windshield (don't place much validity in the door data tag unless it matches the one in the windshield). It will be in the form of 8R01J123456 (a typical number). The critical chatacter is the "J" which is the engine code and may also be "T", a 200CID I6 engine; "C" a 289CID V8 (or 302CID V8 if a late build) 2 barrel engine; "F", a 302CID V8 2 barrel engine; "J", a 302CID V8 4 barrel engine; "X", a 390CID V8 2 barrel engine; "S", a 390CID V8 4 barrel engine; "Q", a 428CID V8 4 barrel engine. Lots of choices. There are two other code that fit in the rumor only classification so don't worry about them. To be truthful, if it's a "T", don't pay very much for the car. With all the other codes, you can get more value if and when you resell. I would assume that Glen has the full list of codes and their breakdown in the FAQ section.