I love it when people claim a stock Ford modular bottom end will hold 1000hp when they routinely let go at levels far below that. If you haven't seen it happen, the blocks are paper thin. It used to be a rat race and top $$$ for a good core without a hole in the side of it.
The Shelby we race and tune on made 989 rwhp. Ran 10.14 at 144 they will last if the tune is right. You cant rev them to high with the stock rods.Ours has a SVO block now with good rods, the car only has 4000 miles on it. New motor has made over 1000 rwhp now.