http://www.jalopyjournal.com/forum/a...es-jpg.401457/
This is just the internal stuff, lacking the outside of the block. A huge problem was keeping all the cores for cavities within cavities to stay in place as the iron flowed in... cores moving around caused the many failures in early 1932 production, when Ford was for a while scrapping more castings than they were sending to machining.
The exhaust system makes the casting an order of magnitude more complex than other familiar engines.
I can't think of any engine I know anything about with a block anything like that complex. Think about casting an overhead V8 from the cores shown...you could literally discard half the things in that picture. A Chevy SBC is very simple in comparison, and modern OHC engines have an even greater simplification of basic architecture.
This would take a dedicated and clever foundry that could be making a lot more money more easily popping out Chevy stuff for drag racers.