CREATE TABLE table_68639 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What is the lowest points of using mclaren m14a as chassis?
SELECT MIN("Points") FROM table_68639 WHERE "Chassis" = 'mclaren m14a'
SELECT MIN("Points") FROM "table_68639" WHERE "Chassis" = 'mclaren m14a'