CREATE TABLE table_68737 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Pts." FLOAT)

Which chassis has a year later than 1964, a Ford engine, and 13 points?
SELECT "Chassis" FROM table_68737 WHERE "Year" > '1964' AND "Engine" = 'ford' AND "Pts." = '13'
SELECT "Chassis" FROM "table_68737" WHERE "Engine" = 'ford' AND "Pts." = '13' AND "Year" > '1964'