CREATE TABLE table_4606 ("Team" TEXT, "Chassis" TEXT, "Engine" TEXT, "Tires" TEXT, "Drivers" TEXT)

What chassis did Gordon Johncock use with his cosworth engine?
SELECT "Chassis" FROM table_4606 WHERE "Engine" = 'cosworth' AND "Drivers" = 'gordon johncock'
SELECT "Chassis" FROM "table_4606" WHERE "Drivers" = 'gordon johncock' AND "Engine" = 'cosworth'