In a small saucepan over medium heat, melt the butter and add the chocolate, stirring until melted and smooth. Set aside to cool for 8 - 10 minutes.
In a medium bowl, beat eggs, sugar, bourbon and salt, until well blended. Once chocolate mixture is cool, whisk into egg mixture until well blended. Fold in the pecans.
Pour into prepared pie crust. Bake for 45 - 55 minutes. There will be cracks on top, which is normal, as it cools they will pretty much go back together. Center should be set, but not overcooked. Once it starts cracking, it's close to being done.