Nice to see some interest in Gran Coupes out there. I would rather see them restored as Gran Coupes instead of being cloned into a 'cuda.
Check the Data Plate for code C26. This is the code for the overhead console. It is standard equipment on GC's & SE's. If the Data Plate does NOT have code C16, then chances are it is a column shift. C16 code is for the center console. GC's shoule also have codes M21, M31, & M88. I think M25 was optional but not sure. the first three are the trim for Roof drip rail moldings (all e-bodies - i have yet to see any that don't have M21), Belt Moldings (door top - 'cuda's has this as an option - standard on GC, and decklind molding (This is the same as the '72 to '74 'cuda. The code is the same for '70 & '71 'cuda, but it is different trim. although i have seen two GC's that had the 'cuda tail trim - factory error??) M25 is the Wheel Opening Molding. I have had two GC's and both had M25, as well as all the rest.
Leather was standard, but cloth AND vinyl were options. The vinyl has a different pattern & grain than the standard Barracuda/'cuda vinyl, as well as little medallions.
A/C was also standard, but optional delete. Most GC's that i have seen also had the V5_ side trim, but again, i am not sure if that was standard.
My current GC is an EB3/V1X with H6B5 interior - no blue leather or blue cloth was offered, so it had to be vinyl!
It isn the rotisserie at the moment, and i am contemplating dropping in a 5.7 Hemi/auto. Any thoughts as to keeping the color combo & the 5.7?