I doubt there are many drop in headers for big block cars...altho I had a set of hookers on a BB chevy that I installed without much hassle.
It would not have been too bad except for that. Getting the engine mount holes lined up was hard...mainly because the view was obstructed so it was a guessing process...but it's in and I think I found the transmission linkage clamp that broke so I am smiling more at the moment LOL