Vipers are not allowed into the Turkey Rod Run show except on Sunday due to model year cut-off. The only exception is if your Viper or other post '79 car has been extensively modified (there is a list of modifications that will get you in, body work, custom paint, lowered, etc) and is then only allowed in by pre-registration and inspection at the gate to prevent cheating.
see
www.turkeyrun.com for full details and entry forms
On Sunday they have no restrictions but most people have left anyway, hence raising the restrictions to get Sunday attendance up.
There is a spring show at Daytona, March I think, that has no age limit restrictions and is not on a major holiday weekend.
JT