Realistic valvetrain expectations.

I'm well aware of the expenses involved. I was figuring @13k in parts alone. What is it exactly that is making these goals so lofty? The bottom end strength, oiling, ect can all be improved. What is it that makes these new engines so damn potent and do it so reliably? A square port LS is putting out about 500hp @ the crank with 250k reliability, and 600 is a cam swap away. Where is the magic in these newer engines that we can't mimic?