Sour Cream Walnut Cake

Sour Cream Walnut Cake (Bubbe got this recipe from the paper when I was born!)
½ c butter
1 ½ c sugar
3 eggs separated
3 T grated lemon peel
2 c sifted flour
1 t soda
1 t baking powder
¼ t salt
1 c sour cream
1 c chocolate chips
1 c chopped walnuts
2 T OJ
2 T lemon juice
Cream 1 c sugar with butter. Add egg yolks singly and beat well after each. Stir in lemon peel. Sift flour, soda, baking powder, and salt. Add alternately with sour cream, blending well. Beat egg whites until stiff and add chocolate chips and nuts. Grease and flour pan. Bake at 350 for 50 min. while hot, baste with sauce (1/2 c sugar and juice boiled for 1 min).