Arrange cherries evenly in the pastry shell. Dot with butter. In a large bowl, combine 1-3/4 cups sugar, flour and salt. Stir in the eggs, sour cream and lemon juice. Spread evenly over cherries. Sprinkle with remaining sugar.
For baking:
Bake at 400° for 10 minutes. Reduce heat to 350°; bake 30 minutes longer or until topping is set. Cool for 1 hour on a wire rack. Refrigerate for 3-4 hours before cutting. Garnish with whipped cream when serving, if desired. Refrigerate leftovers.