You would get a score of one. This would make you 2 under par for that particular hole. Your current score would depend how many strokes it took to complete whole one and two to give your current score at the end of that hole.
Three score and 9 centuries would be 3 X 20 + 9 = 69 centuries, or 6,900 years. A score is simply 20, just as a dozen is 12. A score of years would be 20 years, four score and seven apples would be 4 X 20 + 7 = 87 apples.