440 in an A Body?

I want to Thank everyone for their replies. The mufflers are bolted to the collectors while waiting for the exhaust shop to get me so while I was under the car looking around while my brother turned the wheels I noticed that the muffler hanger had broken and the weight was causing the header to droop and rub on suspension more work but at least it's not a mystery.

To BMSJAX what kind of gaskets are you using?