Well, if the center carb is 4782, it’s a 350 cfm. If the outboards are 4783, they are 500 cfm and mechanical secondaries. They were an over the counter setup available through a Mopar dealer. The bowls will all be the side hung Holley with driver fuel inlet. If they are center hung bowls with vacuum pods, they are Corvette carbs or bowls. I picture is worth a thousand words. Carb numbers will help too.