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Bake until a wooden pick inserted into center of Cake comes out clean, 20 to 22 minutes. Let cool in baking sheet on a wire rack while preparing Fudge Icing.
Prepare the Fudge Icing: Melt butter and chocolate in a medium saucepan over medium-low, whisking often, until smooth.
Remove from heat, and whisk in buttermilk, soft drink, and salt.
Gradually sift in powdered sugar, about 1/2 cup at a time, whisking until fully combined after each addition.
Immediately pour icing over warm Cake, spreading evenly using an offset spatula.
Sprinkle with pecans.
Cool completely in baking sheet until icing is set, about 1 hour.