CREATE TABLE table_71686 ("Year" TEXT, "Start" TEXT, "Qual" TEXT, "Rank" TEXT, "Finish" TEXT, "Laps" FLOAT)

What qual had a finish of 16 in 1968?
SELECT "Qual" FROM table_71686 WHERE "Finish" = '16' AND "Year" = '1968'
SELECT "Qual" FROM "table_71686" WHERE "Finish" = '16' AND "Year" = '1968'