Glad to see someone one else taking on the 496. I'am still here just haven't worked on my vette in some time. If you read my entire thread you have seen all the things that have to be done to install this BBC. One of the things I did not post was the fact that I had to modify my left side side pipe headers. If I knew what the real problem was I would not have done the modification. For some reason the engine is twisted just enough that the headers touch the frame on the drivers side. I suspect it's the engine because my frame was put on a alignment machine and all dimensions were checked and adjusted. If I had it to do over I would have cut the motor mount and re welded it, problem solved. It cost me $500 to have the header modified. Raylar is the go to people for making this BBC scream, just costs big bucks. I do believe the Edelbrock elbow and Dart intake will be a good combination. Anything I can help you with just let me know.