Grease and flour two 9x5-in. loaf pans. Line the bottoms with waxed paper; grease and flour the paper. Set aside.
Combine the pecans, pineapple, peaches, raisins and 1/2 cup flour; set aside.
In a large bowl, cream butter and sugar; add the eggs, one at a time, beating well after each addition.
Add 1/2 cup peach nectar, honey and milk; beat well (mixture will appear curdled).
Combine cinnamon, baking powder, salt, allspice and remaining flour; add to the creamed mixture and mix well.
Add pecan mixture; stir well.
Pour into prepared pans.
Bake at 325° for 1-1/2 hours or until a toothpick inserted in the center comes out clean. Cool for 10 minutes.
With a skewer, poke holes in the loaves. Spoon remaining nectar over loaves.
Let stand for 10 minutes; remove from pans to a wire rack to cool completely. Wrap tightly and store in a cool place. Slice and bring to room temperature before serving.