CREATE TABLE table_14439 ("Player" TEXT, "Position" TEXT, "Round" TEXT, "Overall" FLOAT, "MLB Team" TEXT)

What position was less than 421 overall played by Matt Clark?
SELECT "Position" FROM table_14439 WHERE "Overall" < '421' AND "Player" = 'matt clark'
SELECT "Position" FROM "table_14439" WHERE "Overall" < '421' AND "Player" = 'matt clark'