will 73 Dart small block hedman headers fit a 68 dart?

Yes I did get the directions. I'm not 100% sure I need to check them but I know they're the 7580 or something like that, it's there long tube headers. Glad I don't have to remove the torsion bars. Did you have to jack up the engine? Also on the directions it says that I might have to replace my motor mounts? How would that help?