Preheat oven to 350*. Place 2 racks on the upper and lower thirds of the oven.
Place bread slices in a shallow baking dish or pie plate. Heat the milk in the microwave for 30-45 seconds (until hot but not boiling) and pour over the bread.
Place all of the meats in a very large bowl. Using your hands (I like to use disposable kitchen gloves) combine the meats until they are well blended.
Add all remaining ingredients, crumbling the moistened bread so that there are not any large pieces.
Mix together with your hands until well blended, making sure to scrape from the bottom to ensure all ingredients are well incorporated.
Line a sheet pan or cookie sheet with parchment.
Roll meat mixture into balls and place them on the parchment lined pan.
Pour 1/4 cup oil into 2 rimmed sheet pans and place in the oven to allow the oil to heat for about 5-10 minutes.
Place the meatballs on the sheet pans with the hot oil and return to the oven.
Bake for about 15 minutes, until the meatballs are browned on the bottom. Turn the meatballs to the other side and then return to the oven, switching the position of the pans, and cook for another 10-15 minutes.
Add the meatballs to the Tomato Sauce and simmer for at least 30 minutes and up to 2 hours to tenderize and absorb the flavors from the sauce.