CREATE TABLE table_name_83 (points NUMBER, engine VARCHAR2, year VARCHAR2)

What are the highest points that have a Mugen V8 engine and happened in 1991?
SELECT MAX(points) FROM table_name_83 WHERE engine = "mugen v8" AND year = 1991
SELECT MAX("points") FROM "table_name_83" WHERE "engine" = "mugen v8" AND "year" = 1991