This episode's headline: Saudi Arms Showdown; Plan for Action; Uncaring Care?. The guests include In Washington: Sen. ALAN CRANSTON, Democrat, California; Sen. DANIEL EVANS, Republican, Washington; ARTHUR HARTMAN, Ambassador to Moscow; Sen. DAVID PRYOR, Democrat, Arkansas; PAUL WILLGING, American Health Care Association; In Vienna: MORRIS ROSEN, International Atomic Energy Agency; REPORTS FROM NEWSHOUR CORRESPONDENTS: MARYANNE KANE, in Boston. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; JUDY WOODRUFF, Correspondent