1966 Berger Chevelle SS 427/435

[beachbud]

I just purchase a 1966 Chevelle SS sold new from Berger Chevrolet. The car was a drag racer most of it's life being titled for the first time in 2007. I'm the third owner and on the title from Texas where it says Previous Owner listed is Berger Chevrolet. It has the metal chrome " By Berger" on the back. The car was restored with a 1966 427/435 big block, 4 speed and 12 bolt posi. The car came new Mariner Blue/ Mariner Blue interior. It has is dark blue w/ black vinyl top, black bucket seat interior.
I don't have any paperwork on this car and would like to know what I need to do to have the car authenticated ?