You probably want to post a price or the moderators will tell you about it - it's one of the rules for selling a car.
I would also recommend a picture or two of the interior.
This post could also be posted in the B4Black forum.
A few corrections - 215 1982 Grand Nationals were produced, with the actual number of units having the 3.8 turbo motor being in slight dispute - but somewhere around 30-40 units of the 1982 GN had the 3.8 Turbo motor. Few still exist. They seemed to pick the cars at random for Cars & Concepts conversion - so that might owe to the unknown numbers.
That "rumor has it that 100 something were never sold " is just that - some rumor.
As far as this specific car goes - and the B4B experts probably have more info - but in its day - as the Silver and Maroon paint combo - it was a looker.
And pretty rare as they go.
Unfortunately, owing to the change in paint scheme and loss of the original TC motor - what you have now is just another 1982 Regal.
Sadly. Since time got another one.
But good luck with your sale.