have you ever seen this before

No its a 455/467 engine. There isn't any rag in the intake. I just had the intake hot tanked last week. Engine ran fine until the carb leaked some gas and had a fire under the hood. The heads are Edelbrock 87 CC D-Port 300cfm heads. Engine was built by Butler Performance down in Tenn. back in 2012. I just have never seen this before.