Help !! Running super rich.

Engine needs air and fuel both. Obviously you have (more than) enough fuel. So, where is the air getting into the engine if the throttle blades are all closed?
Exactly. It’s acting like it’s got a giant vacuum leak . Lol. But I mean. I’ve swapped sbm intakes countless times in 20 years. There’s not a lot to it. I’ve plugged everything off. I’ve replaced gaskets 3 times. Lol. Ram like a top with 2bbl. As soon as I put the 4bbl. Garbage lol