Hello.

If the car has front drums, it almost certainly isn't a factory GT, since the front discs were part of the GT package. It would make no sense at all for someone to swap the discs out with drums.

Some of the door tag info is indeed lost forever, like the D.S.O., but most of it can be figured out with a little bit of poking around. If you could tell me the vin, I could tell you within a day or two what the scheduled production date of your car was. If you're car is an original pony interior car the door panel won't hit the side of the seat when you close the door. There should be a gap between the door panel and the seat with the door closed. Standard seat back frames are different from pony. Also, you can pull one of the courtesy lights out of the door and look at the rectangular hole. If it looks like someone hacked it out with a sawzall or something, Ford didn't do that.

The hole Ford would have put in there was very neat and symmetrical. You can pull out the back seat and look at what color the floor is there. That's what color your car was originally. Most people don't go to the trouble of painting the floors when they repaint a car. The original color is also underneath the undercoating in the front wheel wells up around the hood hinges.You can look around the base of the dash and maybe pull off the courtesy lights and stuff and you will probably see what color the interior was originally. If the rear axle has the tag still on it and it's the original rear end, it will tell you what gear the car came with. If the neutral safety switch hole is in the firewall, the car came with an automatic transmission originally. If it's originally a manual transmission car, there isn't really any way to know if it was a three speed or a four speed car unless it still has the original transmission that still has the tag on the side of it. Hope that helps.
