According to the 2005 Ford Performance Parts catlog, the M-6010-A460 cast iron block can be bored/stroked to produce 598 cubic inches. It indicates that it is setup for wet sump oiling, but I believe you can convert it to a dry sump system.
It has a list price of $2,095
As an alternative, you could go with an Eliminator iron block available through
http://www.flatlanderracing.com/
You can get up to 642 cubic inches with these blocks and a big stroker crank.
Cheers
Bill D