CREATE TABLE table_15839 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Points" CLOB)

Before 1976 and with 12 points, what chassis did the Ford V8 have?
SELECT "Chassis" FROM table_15839 WHERE "Engine" = 'ford v8' AND "Year" < '1976' AND "Points" = '12'
SELECT "Chassis" FROM "table_15839" WHERE "Engine" = 'ford v8' AND "Points" = '12' AND "Year" < '1976'