CREATE TABLE table_68075 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Name the least points for chassis of kurtis kraft 500a
SELECT MIN("Points") FROM table_68075 WHERE "Chassis" = 'kurtis kraft 500a'
SELECT MIN("Points") FROM "table_68075" WHERE "Chassis" = 'kurtis kraft 500a'