Wich should i buy a 1967 shelby GT500 a 1968 pit viper mustang or 1969 camaro SS?
The '67 Shelby. It has either a 390 or a 428 c.i. V8. They are monsters and were pretty much the most Iconic muscle car ever.
I like the 1969 Camaro, but those are too common with muscle car enthusiasts. They are great but don't come close to a Shelby especially a SS. A Z/28 is a more even match, but the Shelby still out-performs it hands down.
And as for the 1968 Pit Viper, I would suggest that over the Camaro, its a modern muscle car. I love the look of them, and those you never see on the roads. I just Googled it right now and they are great. Very modern yet retro looking (since its on a '68 body and chassis.)...I like it, it looks like the Eleanor from Gone in 60 Seconds.
It all comes down to if you like an all stock (original specs) car like the GT500...or a Custom car (the Pit Viper.)