The Motorsport alum. block they have in the catalog that RDI sells will accept wedge and Hemi heads both. The water jacket holes in the deck are round, and you can plug-off or drill your own holes in the deck if you need to, and actually I think they're more reasonable than the Shelby blocks for the FE's. The FE guys are getting their eyes gouged out by Shelby on his alum. block, I think they're over $5,000! The 10.300" deck wet sump water jacketed block from RDI is $4,800-$4,900.
The nice thing is that the RDI block will go 4.600" and even bigger on the bores, all you have to do is pay someone like Holbrook to bore/hone or re-sleeve this thing, and you're good to go. The part number is M-6010-A96.
Be cool, thanks for the welcome!!
Eric