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The Frenchtown Flyer once showed photos of a three carburetor set-up made from the center portions of 3 stock "log" intake manifolds, with balance tubes connecting them.
Here's another possibility - use the lower half of an EFI intake and fabricate whatever top you want to use for , one, two, or more carbs. I have even made plenum boxes from hardwood coated in epoxy resin. Good luck and don't be afraid to fail.
I know this is an old thread but wanted to add to the sweetness...
Not sure if this is going to happen, but may do efi with it...2.3 Mustang throttle bodies. Would make a plate for the tb's and injectors so the intake remains as cast.