If I wanted a larger Cobra I would go with Classic Roadsters. They been around a LONG time and Ed Combs and Don Scott are both active members of Club Cobra.
Don Scott
http://www.classicroadsters.com/classic/docs/home.cfm
Ed Combs (Founder of the famous "Spring Fling", and builder of the Double Venom). Viper V-10 in a Cobra.
http://www.cobras.com/elite/docs/home.cfm