With the feedback received here and with some convincing from a friend of mine, I've decided to go with stock manifolds instead of headers, though I did order the Magnaflow package yesterday, so I'll need the connectors too.
Any suggestions as to where I should get the manifolds?
Mark
68 Firebird 350 auto (sold) 70 Trans Am RAIII 400 4-speed (sold) 2011 Challenger SRT8 IE392 6-speed (sold) 2017 Challenger Hellcat 1966 Dodge Coronet 440