pretty sure i found an undocumented 69 yenko. need help

[oldskoolss]

This is a long story, but I'm pretty sure Ive found a 69 yenko. original owner, fathom green car. Gentleman who owned it was a sponsored driver. 744 original miles. numbers matching car with a crated nickey 427 sitting beside it in the garage. It has never left his possession. His elderly wife has it now. I will have an opportunity to see the car in about two weeks. It hasn't left her home since the mid 70's. She will not give me the VIN over the phone. She is understandable secretive about the car as she is elderly and doesn't want to be taken advantage of. I just want to rattle someone's brain who can lead me in the right direction as I try to buy this car. I just have some questions, if someone can lead me to someone who is an authority on them.