Who sells a nice crankshaft for $700? 440source? No thanks. Even a Scat is more than a grand, and that's about as low on the manufacturer pole as I'd go. You guys keep saying "very high horsepower", but I don't think you realize just how much power we lose at 6000' above sea level. As I said, this combo MAY make 550hp on 10lbs of boost, but probably more like 500-525. You wouldn't trust a factory forging that has been mag'd to 500hp? This isn't a roots or screw blower, It's centrifugal and low boost.
Maybe I'm completely wrong in my thinking, and need to go back to the drawing board.