Hi K.G.;
Here's a recipe I found on the net, just might be the one, hope so.
Prize Orange Coconut Cake

Ingredients (10 servings)

ORANGE COCONUT CAKE:
3/4 c Chortening, creamed with
2 c Sugar
1 1/2 ts Grated orange rind
2 Eggs yolks, well beaten

Blend together,then sift:
3 1/4 c Cake flour,sift once
4 1/2 ts Baking powder
1/2 ts Salt

Add to first mixture with:
1/2 c Orange juice
3/4 c Water
Beat enough to make batter

Smooth. blend in:
1/2 c Moist, shredded coconut
4 Eggs whites, beaten stiff

Instructions
Pour into three 9 in chake pan, greased and floured. Bake 30 minutes in moderate over 350F. Put layers together with Orange filling and cover with orange frosting. Sprinkle with 3/4 c. moist shredded coconut. PRIZE ORANGE FILLING: 2 T. flour, 4 level T. cornstarch, 4 egg yolks, well beaten; 1 c sugar; 1/2 tsp. salt. Mic smooth in double broiler. Add slowly the following, stirring constantly: 1/2 c orange juice; 3 T lemon juice; 1/4 c water; Add: 2 T butter, grated ring of 1 orange. Cook over water, stirring occasionally until thick, about 20 minutes. Cool. Spread between layers of cake. ORANGE FROSTIMG: 1 tsp white corn syrup, 7/8 c sugar, 1/4 tsp grated orange rind, 1 egg white, 3 T orange juice. Put in double boiler. Beat constantly with rotary beater while cooking over boiling water 6-7 minutes. Remove from heat, ad: 1/2 tsp lemon juice, sprinkling of salt. Beat thoroughly and spread on cake.