Preheat oven to 325°. In a large saucepan, combine butter, sugar and corn syrup. Cook over medium-low heat until sugar is dissolved; cool slightly. In a large bowl, whisk eggs, bourbon, vanilla and salt; slowly whisk in sugar mixture. Stir in pecans; pour into crust., Place on a baking sheet. Bake until a knife inserted in center comes out clean, 55-60 minutes. Cool on a wire rack.