Next question, why are the heads still $12k?

A guy like me that has pretty much wants to go fast in a bracket type car would love to do a 572 or 605 one of these, but the heads at $12k puts it out of my range by a bunch...Is there really that much machining in them? I am thinking these would be way better than my Hemi heads that flowed in the 450's.....So technically, all I would have to do is change cam, pistons, heads & intake, headers. vs. maybe RBRE rockers......Sure lowers the possibility of a dropped valve some.