This episode's headline: GM Strike; Roadblock; Conversation - Master Builder; Poem for Dad. ANCHOR: JIM LEHRER; GUESTS: HARLEY SHAIKEN, University of California, Berkeley; DON GONYEA, National Public Radio;DAVID BRADLEY, J. P. Morgan; MARK SHIELDS, Syndicated Columnist;PAUL GIGOT, Wall Street Journal; RENZO PIANO, Architect; ROBERT PINSKY, Poet Laureate; CORRESPONDENTS: KWAME HOLMAN; ELIZABETH FARNSWORTH; TOM BEARDEN; DAVID GERGEN; MARGARET WARNER