EFI ready Small Block intakes ???

DC offered several EFI ready manifolds in the M1 lineup- both 2 bbl. and 4 bbl. models, but no longer available new, naturally.
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Professional Products had their 2bbl. Crosswind manifold, Speedmaster had a 4 bbl. manifold; also no longer available.
Only one currently available that I know of is the Edelbrock Super Victor EFI, but I don't believe it's compatible with factory parts; only their Pro-Flow system.
Your best bet is a Wanted ad on this site, they're still out there.