I should be able to find this elsewhere, but I don't trust just any old site. How much cooked pasta does 2/3 cup dry pasta make?

Depends on what kind of pasta. A few examples: 1 pound spaghetti = 8 cups cooked; 4 ounces small shells = 1 1/2 cups dry = 2 - 2 1/ cups cooked; 4 oz spirals = 1 3/4 cups dry = 2 1/4 cups cooked. If it is packaged, you might find specific information on the label.