Boys,
Apparently, the only one I could find was the older Edelbrock X-C96 Cross-Ram for a Big Block.
Click on pics to enlarge.
I figured this would be the case, I have seen those before at various swap meets over the years. It seems the big block never had as much aftermarket support that built various carb combos. You see the injection, typical dual quads and tunnel rams. There was a super rare 4x2 Man-a-fre setup and i have never seen a non Corvette tri power set up for a big block, though i have never really looked.
Currently only have small blocks and outside of my Camaro and C10, everything has multiple carbs. Have dual fours, tri power and 6x2's. I really enjoy playing around with the multi carb setups