Place pasta, cubed feta, sliced pepperoni, tomatoes, black olives and parsley into a large bowl; mix till combined. Add 1 cup of the dressing to salad and toss till all is coated well with dressing. Chill 1-2 hours. Before serving add about 1/2 cup (more or less to taste) to salad. Toss and serve. Chill leftovers.