For the sake of stopping this quicker, go back and read the op's 1st post. Does that sound like 600 HP ? Then look at post 21.
My posts are to give Brooks an idea of what he's in store for trying to build a 600 HP stock stroke 400, I guess the thing I'm forgetting is he wants to use nitrous also, which makes things alot simpler parts wise. I was thinking n/a & that's straight out of the max performance Mopar big block book.