INDIANAPOLIS. May 2*.—(UP)—Four vacancies remained in th* starting lineup for the Memoriallt;Day speedway rare as prospectiveentrle* resumed test trials today.Favored to win the four places were Louis Meyer, Huntinfcton Park, Cal., who won the 500-mile classic in 1928 and 1938; Fred Frame, Los Anglic**, who won in 1032, and Mauri Rose, Dayton, lt;X and Lou Moore, Ixs Angelas. *Five other drivers have entered, 1 but their mounts were not be.iieved fast enough to win a place among the 33 starters.Four drivers braved a treacherous wind to qualify Monday. They were Harry MaeQuinn, Indianapolis, who average 114.119 miles per hour over the 25-mile test run; •‘Deacon” Lit*, Dubois, Pa., who averaged 115.997; Ray Pixley, Fullerton, Cal.„ 110.703 and Roy Painter, Detroit 109.867,