Real- Wage Bill's Goal Is March 31
Treas Dept sends to Cong details of Pres Carter's proposal for real wage ins program, but Adm strategists indicate White House may abandon proposal if HR does not approve it by end of March; Treas Sec Blumenthal, in lr to Cong, says plan promises 'direct and major impact on wage-price spiral'; Adm keys passage to mo of March because teamsters' union and major trucking cos hope to negotiate new contracts by that date (M)