Although the GT/CS is much more rare, and the fact that I own a GT/CS I would still vote for you to get the fastback.
The price of a GT/CS will probably never reach that of a fastback, at not least in the near future.
Of course if you want something different then get the GT/CS, although many people will think it is just a copupe.
Ooh, Tough one! I had a J code GT/CS and a black 68 390 GT Fastback at one time. Is one an auto and the other a 4sp? I would go with a 4sp GT/CS over an automatic GT Fastback, or vis-versa. With everything being TOTALLY equal though I would probably steer more towards the GT Fastback.
is there a link here to show between the two or are you just asking in general? sorry im a newby but wanted to make sure. i have a 68 fastback gt and i look at all the suckers in others and smirk....they just wish they had what I got. but thats just me.
I`l be odd man out,
id go with the 4 spd 390 GT/CS as you can get a fastback 390 car fairly easy
if you want one
but any 390 GT/CS is rare,let alone a 4 spd one and a heck of a lot more unique
it depends what you like more, rare/production #, or the popular cars and max doller value