KB Stage 10 Hemi Blocks?

I see a few for sale on R-Junk. Has anyone utilised a Stage 10 Keith Black Hemi block? In a bracket car or NSS type application. These ones appear to be a 4.187 bore version,sleeves apparently max out at 4.310. Can the sleeves be purchased to go up to 4.50 with K.B not manufacturing them anymore? today everything seems to be 4.50. What would the max engine size be with the 4.187 sleeves? Engine bore and stroke combo's? Any info appreciated.

Thanks Fred,
I seen that small print on the KB website, and was wondering if this would be any different than running a filled block, and if they had been run on the street or in bracket class cars in the past. I wonder if OEM style heads fit on these blocks? Thinking of drag car only application. What is the wait time on the World Alum Blocks?