CREATE TABLE table_67849 ("Year" FLOAT, "Chassis" TEXT, "Engine" TEXT, "Tyres" TEXT, "Points" FLOAT)

What point is the lowest for listings of chassis labeled AGS JH23 before 1988?
SELECT MIN("Points") FROM table_67849 WHERE "Chassis" = 'ags jh23' AND "Year" < '1988'
SELECT MIN("Points") FROM "table_67849" WHERE "Chassis" = 'ags jh23' AND "Year" < '1988'