[iluv69s]

I guess one can never have 100% proof that the motor is 'born with'... I am sure there are experts here that could build an undetectable LS-6..or COPO... let's face it... If the experts say it is original, that is all we can go by. They are who everyone calls to document originality anyway.
I know there are experts that have made mistakes, but atleast I believe the vast majority of the real 'experts' nowadays are sincere and honest..(ie... Verne, Rick, Kurt S.. etc.)
Not talking about just your local appraiser that is a 'supposed expert' on all makes and models. I'd have much less faith in an appraiser/documentation from those type appraisers. Although a few cars I have bought had those type appraisals/docs, I saw obvious mistakes in the apprasials about original equipment, etc. I would never trust them and always decided on my own if car was original/correct before purchase. Ive never hired an expert/appraiser prior to purchase, but have enough knowledge to know what I am buying. That's why I usually stick to Camaros.
But bottom line is it is wise to hire an real expert PRIOR to purchase if you don't know enough about the car you are about to buy.
Also I would much rather have an unrestored barn find w long time storage/ownership than a car that has been restored. Even some of the most well known collectors did some shady things many years ago with these cars..sometime without any malice or never realizing the future.

my .02