Gary G. Montanus, sr. v.p., marketing, for Worldvision, has been elected prez of the Advertiser Syndicated Tv Assn. Clark Morehouse of Tribune Entertainment will serve as v.p. of the organization. Other members of the new ASTA board of directors are Rich Goldfarb of Turner Broadcasting Sales, Mike Shaw of Buena Vista TV, and Brian T. Byrne of Byrne Enterprises.