CREATE TABLE table_204_630 (id DECIMAL, "no" DECIMAL, "date" TEXT, "race" TEXT, "track" TEXT, "winner" TEXT, "reports" TEXT)

who was the top competitor at the carolina 500 ?
SELECT "winner" FROM table_204_630 WHERE "race" = 'carolina 500'
SELECT "winner" FROM "table_204_630" WHERE "race" = 'carolina 500'