The provisions of this chapter and sections 17b-743, 17b-744, 45a-257, 46b-1, 46b-6, 47-14g, 51-348a and 52-362 shall apply to all actions for dissolution of marriage, annulment and legal separation filed after May 13, 1974, to all actions for annulment, legal separation or dissolution of marriage commenced prior to said date and to appeals from, and motions for modification of, any alimony, support or custody order entered pursuant to a decree of dissolution of a marriage, divorce, legal separation or annulment rendered prior to said date. The provisions of this chapter and sections 17b-743, 17b-744, 45a-257, 46b-1, 46b-6, 47-14g, 51-348a and 52-362 in effect on October 1, 1973, shall continue to apply to any action for dissolution of marriage, annulment or legal separation in which a decree of the Superior Court has been rendered after October 1, 1973, in which an appeal is pending or in which the date of taking an appeal has not expired on May 13, 1974, except an appeal from any order of alimony or custody. Sections 46-13 to 46-30, inclusive, of the general statutes of Connecticut, revision of 1958, revised to 1972, shall continue to apply to any action for divorce, dissolution of a marriage, annulment or legal separation in which a decree has been rendered and in which an appeal is pending or in which the time for taking an appeal had not expired on October 1, 1973, except an appeal from any order of alimony, support or custody.