Combine ham, pork, cracker meal, milk, parsley, and pepper in a bowl; blend well. Shape mixture into about 18 to 24 balls. Place 2 tablespoons oil in a large skillet over medium heat. Add ham balls and brown on all sides. Remove ham balls from skillet with slotted spoon. Add remaining oil to skillet; add onion and green pepper and cook until onion is lightly browned. Pour off excess grease.
In a small bowl, combine brown sugar, cornstarch, salt, and allspice. Stir in orange juice until well blended. Pour orange juice mixture into the skillet and cook over medium-low heat until thickened and smooth. Add raisins and ham balls to the sauce; cover and simmer for 25 minutes. Add sweet potatoes and orange sections; heat through. Ham balls with raisin sauce and sweet potatoes.