HNG/InterNorth’s shareholders have approved changing the corporation’s name to Enron Corp, effective immediately . . . Occidental Petroleum announced the completion of a 478-mile pipeline in Colombia, running from Rio Zulia over the Andes to the Caribbean port of Covenas . . . Florida’s Supreme Court ruled that the state cannot prohibit K mart stores from marketing certificates of deposit and money-market certificates for a Michigan federal savings and loan association . . . Pacific Bell said it has rescinded its plan to sell its coin telephones, citing the inability of suppliers to provide kits necessary to convert the telephones to private use . . . The Investment Company Institute reported that the assets of the nation’s 360 money-market mutual funds shot up $4.83 billion in the week ended April 9.