Was just doing a bit of a lunch time browse and went by the Cleveland Forum to find that someone there is on the cusp of casting Alloy Clevos
http://www.network54.com/Forum/119419/
IMHO once you start going to aftermarket blocks arguements about the relative merits of different (factory cast) engines types tend to hold little water, however I still have an irrational attachment to Clevos so its nice to see that this sort of gear will be available.
(might even build one someday)
LoBelly