Six Pack Carbs?
I don’t believe you can use anything on the outboards but original 6bbl style carbs, not sure about the center carb, but I’m pretty sure that is also unique to the setup. I also hope you have some decent knowledge on how to set up a 6 bbl system, they are pretty finicky u til you learn how to set them up right. But when they’re set up correctly, boy are they a lot of fun. But they do require maintenance to keep them in good working order.