Name the average points for dallara 3087 lola t88/50 and year before 1988
CREATE TABLE "complete_international_formula_3000_resu" (
  "year" real,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "points" real
);
SELECT AVG("points") FROM "complete_international_formula_3000_resu" WHERE "chassis"='dallara 3087 lola t88/50' AND "year"<1988;