Here is some additional information regarding your Tbird. This web page should be a help to you. You can click on various other pages on the left side regarding it. First of all, Paint Code N is Diamond Blue. Trim Code 52 is NOT a original leather interior. If it is leather then someone changed out the interior. Trim Code 52 is MOROCCO GRAIN VINYL BOLSTERS AND INSERTS
Dark Blue Bolsters, Light Blue Inserts. It sounds like someone decided to paint the engine well black, for whatever reason. Do you know what engine is in it now? Apparently you got an additional 352 engine with the car?
4 Cruise-O-Matic (3-Speed Automatic) (Required with 430 Engine)
REAR AXLE CODES
3 3.10:1 352 Engine with Cruise-O-Matic