CRUST: Beat Flour, 1 cup butter, 1/2 cup sugar and salt until mixture resembles crumbs. Heavily grease bottom and sides of 15"x10" baking pan at least 1-1/2" deep. Press mixture firmly into pan and bake at 350 degrees for 20 minutes. FILLING: Blend eggs, corn syrup, 1-1/2 cups sugar, 3 tablespoons butter and vanilla. Stir in chopped pecans. Spread over hot crust. Bake at 350 degrees for 25 minutes or until set. Cool, cut into bars.