Mix 1 large package orange Jello with 1 cup boiling water. While hot, add 1 quart vanilla ice cream and stir until melted. Add 1 small can crushed pineapple, undrained and 7 ounces of 7-Up. On the bottom of the pan (9x13 inch), slice Twinkies lengthwise and place cream side down. Line the entire pan with Twinkies. Pour mixture over this and let stand in the refrigerator overnight.