Tell me the driver for ford cosworth dfv 3.0 v8 and chassis of ts19 ts20
CREATE TABLE "drivers_and_constructors" (
  "entrant" text,
  "constructor" text,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "driver" text,
  "rounds" text
);
SELECT "driver" FROM "drivers_and_constructors" WHERE "engine"='ford cosworth dfv 3.0 v8' AND "chassis"='ts19 ts20';