CREATE TABLE table_68740 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Pts." FLOAT)

What year had a Ford engine and 13 points?
SELECT "Year" FROM table_68740 WHERE "Engine" = 'ford' AND "Pts." = '13'
SELECT "Year" FROM "table_68740" WHERE "Engine" = 'ford' AND "Pts." = '13'