Place beans in a large pot and cover them with water completely. Soak overnight. In the morning, drain and cover with fresh cold water. Cook the beans in liquid, over low heat, for 2 to 3 hours until tender, adding more water as needed to keep beans from sticking. Drain water from beans. Place salt pork or bacon on the bottom and sides of a 1-1/2 quart baking dish. In a mixing bowl, combine beans, syrup, molasses, and mustard. If using bacon, you may want to add a little salt. Pour bean mixture into baking dish and bake, covered at 300ºF. for 2 hours, stirring occasionally. Uncover and bake 30 minutes longer. Serves 6.