That's still available. Offy made cross-ram adapters to bolt to any dual
quad (Offy preferably) intake manifold to turn the manifold into a
functioning cross-ram. The part number is 5497, bottom of page 39 of the
Offy catalog. Any good speed shop should be able to order a pair of them for
you.
If anyone is interested, I can now send you a PDF copy of the Offy catalog.