CREATE TABLE table_70351 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What kind of Entrant has a Maserati Straight-6 Engine, built in the year 1958 or early, and has a Maserati 250f Chassis with points less than 4?
SELECT "Entrant" FROM table_70351 WHERE "Engine" = 'maserati straight-6' AND "Year" < '1958' AND "Chassis" = 'maserati 250f' AND "Points" < '4'
SELECT "Entrant" FROM "table_70351" WHERE "Chassis" = 'maserati 250f' AND "Engine" = 'maserati straight-6' AND "Points" < '4' AND "Year" < '1958'