What are the lowest points that have a Mugen V8 engine and a Reynard 91D chassis?
CREATE TABLE "complete_international_formula_3000_resu" (
  "year" real,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "points" real
);
SELECT MIN("points") FROM "complete_international_formula_3000_resu" WHERE "engine"='mugen v8' AND "chassis"='reynard 91d';