What was the score in the final, that Víctor Pecci was the opponent and winner after 1984?
CREATE TABLE "singles_finals_16_9_7" (
  "outcome" text,
  "date" real,
  "championship" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);
SELECT "score_in_the_final" FROM "singles_finals_16_9_7" WHERE "date">1984 AND "outcome"='winner' AND "opponent_in_the_final"='víctor pecci';