CREATE TABLE table_name_63 (rounds VARCHAR, driver VARCHAR, engine VARCHAR)

Which rounds did Vic Elford with a Ford cosworth dfv 3.0 v8 engine have?
SELECT rounds FROM table_name_63 WHERE driver = "vic elford" AND engine = "ford cosworth dfv 3.0 v8"
SELECT "rounds" FROM "table_name_63" WHERE "driver" = "vic elford" AND "engine" = "ford cosworth dfv 3.0 v8"