Linda's Chocolate Chip Cake

1 yellow cake mix
1 vanilla instant pudding
4 eggs
1/2 C. water
1/2 pint sour cream
1/2 C. oil
4 oz. semi-sweet chocolate squares, melted
6 oz. chocolate chips

Mix all ingredients except chocolates. Then mix in chips and melted chocolate squares. Bake at 350 for 50 minutes.