Appears to have spent some time submerged somewhere. https://nashville.craigslist.org/cto/d/1976-firebird-formulapontiac/6437666537.html
And got depth-charged. Holy smokes, is that a pile. Not even worth $170, let alone $1700. It might yield some usable parts, but holy smokes.
There are those who just hoard these poor cars, then refuse to sell them as they rot, or want an exorbitant amount because "it's a collectible car."