I am going to guess a lot of these parts weren't just laying around. It just seems to me that this motor is way more trick then it needs to be to make that kind of power. The intake flow on the heads dictate it should be making over 700 hp. I'm sure a lot of it was lost trying to make as much torque as possible with different parts limiting hp out put, but it seems to me with some changes it could have made the torque, and made the hp it should have. That's great that they pulled off the Windows in the block, but I don't think that was needed, better parts matching was needed more.