what is the engine that saw a Chassis of porsche 718, and 0 points, prior to 1964?
CREATE TABLE "world_championship_results" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT "engine" FROM "world_championship_results" WHERE "chassis"='porsche 718' AND "points"=0 AND "year"<1964;