First, at the AAIA over at the Sands, Chinese "Cummins" casted B series blocks and 12 valve heads. Considering the Chinese usually do not remove the slag from the pots when they melt steel, I'd be worried about the metalurgy.
The second thing I saw was a B series replica block available with either a 12 or 24 valve head. http://www.payr.com/ I think it was under $750, but just saw them on a dealers website for under $550.
The second thing I saw was a B series replica block available with either a 12 or 24 valve head. http://www.payr.com/ I think it was under $750, but just saw them on a dealers website for under $550.