Syracuse University has acquired a major collection of 78 r.p.m. records from the family of a Manhattan dealer, giving the university what it says is the second-largest collection of 78s in the United States, after the Library of Congress’s. Doubling the holdings of 78s at the university’s Belfer Audio Laboratory and Archive, the collection of more than 200,000 records was donated by the family of Morton J. Savada, who ran the Records Revisited store on West 33rd Street in Manhattan for 29 years and died in February.