Some kind of funny business there. I’m guessing that the ‘...by contacting us you agree to any kind of contact from us....’ is the key. You may get told ‘We sold it, but look at this Kia! Nissan! Mitsubishi!...’ and on and on. I guaran-damn-tee you they don’t have a Stage 1 four speed vert for $11k. Patrick
Don't get excited it's a scam! I did go and look at this actual car a couple months ago a a dealer in Pennsylvania, he was asking 34k The pictures in the scam ad or from when he bought the car they been floating around on the Internet for the last five years.
It was a non-numbers matching Stage 1 4 - Speed with previous bodywork as you can see in the pictures the body needed a lot of repair if it had any stage one parts other than the rear it probably would've been in my garage right now and I would've sold my grand national.
This one is more believable. https://www.hemmings.com/classifieds/cars-for-sale/buick/gran-sport/2321386.html