Aluminum Head /6

This should be some masters thesis design for a CNC student. Make it in 2 parts, an upper and a lower so you could route out the water jackets and bolt them together. No $$ casting involved, just 3 hours on a CNC and 2 blocks of 6061. you could go bananas if you changed the intake port direction to be more vertical.

Oooh. I like the idea of two chunks of aluminum in a modular design.
With some key dimensions I could model that in Creo/Pro Engineer. (If I was allowed to work on private junk)

And since we're dreaming...4 valves, belt driven cam in head using some off the shelf modern rocker arms from some little Nissan, Honda, Fiat, whatever.