Chocolate Zucchini Cake

1/2 cup margarine
2 eggs
2 1/2 cups unsifted flour
1 tsp. baking soda
2 cups diced zucchini (1/4 in)
1/2 cup oil
1 tsp. vanilla
2 tbsp. cocoa
1/2 tsp. cinnamon
1/4 cup chocolate chips
1 3/4 cups sugar
1/2 cup sour milk
1/2 tsp. baking powder
1/2 tsp. cloves (ground)

Beat butter and oil together and add sugar gradually beating thoroughly.
Beat in eggs one at a time.
Add vanilla at any time during the above beating.
Sift dry ingredients together and add alternately with sour milk.
Add flour first and last. (best done with mixing spoon rather than mixer)
Fold in zucchini and chocolate chips last.
Spread in a 9x13 in. greased and floured pan.
Bake at 350F for 40-45 mins. or until a toothpick comes out clean.