OPPOSITION MAKES IMPRESSIVE GAINS IN VIETNAM VOTING
early returns show that opposition candidates will probably win 50 to 60 of the 159 seats in lower house; winners may include many independents whose views are not known; of 1,240 candidates, 118 are incumbents and only about 30 of them are re-elected; An Quang Buddhist faction apparently gains some 30 seats; showing held significant because Buddhists are majority in S Vietnam; Bunker met yesterday with Nguyen Van Thieu, presumably to discuss both pres and lower house races; elections considered to have been reasonably well conducted, although 2 anti-Govt incumbents, Ngo Cong Duc and Vuong Van Ba, charge they lost because of intimidation and dishonesty by Mekong Delta prov chiefs apptd by Nguyen Van Thieu; anti-Govt candidates are more successful in big cities, while Nguyen Van Thieu supporters are strongest in countryside; Sen Tran Van Don is one prominent opposition winner; details on other results; Saigon election scene illus