I don't understand why people think you have to do something special to BB to make it turbo friendly.
Because with good heads and a stroker kit and a turbo, it goes kaboom real easy above 750hp...The block is a big limiter hp wise. Which is why most will just build a 700hp NA stroker.
I have no first hand experience with this for a BB. However I do have substantial experience with imports. Everybody always said these particular motors come apart at 300 Hp. I have proved that wrong by a long shot. Lost of boost and lower RPMS the import engines live very well. A HP number is just that a number.
A 440 making 800 HP n/a will have to spin much higher ( be a tightly wound motor) than a 440 under 15 psi. A 440 under boost will make so much more tq and HP at a lower rpm than a NA I believe it will last a long time. I will see soon enough.
