Good luck finding something that works for you. This is the reason I'll most likely make my own.
Are you set on SS? Dynatech also has a header available but they aren't stainless
http://www.dynatechheaders.com/m_camaro_67_69.html Again, no idea if they'll fit the DSE subframe.
Have you considered having a custom set made? This might be an option for you. I'm not sure on costs but the idea sounds pretty cool.
http://www.icengineworks.com/