Joe,
To answer your question, I am not aware of a duel plane "tunnelwedge" unit. I'm pretty sure it does not exist....But I have learned to never say never here
Steven
P.S. I have a factory ford single plain duel carb unit on my car and I am very happy with it. I have heard that one should be very careful when looking at the Dove mfg. units due to poor quality control.