xy falcon gs

[jackd7]

i have recently bought an xy factory v8 falcon rolling shell in pretty good nick (well... what i and others thought was just a standard falcon) it turns out it is a factory y code falcon gs. my plan was to build this to a gt replica, but now i am going to restore to it's originality as a gs. i was told that the gs is worth alot more than a gt replica, can anyone tell me how true this is and about what it will be worth on completion.
i paid 2k for the shell.