CREATE TABLE table_42264 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What's the least amount of points that Walter Wolf Racing had after 1974?
SELECT MIN("Points") FROM table_42264 WHERE "Year" > '1974' AND "Entrant" = 'walter wolf racing'
SELECT MIN("Points") FROM "table_42264" WHERE "Entrant" = 'walter wolf racing' AND "Year" > '1974'