In case you want to save a bit of work on the manifolds, here's the link to Summit Racing's headers.
http://www.summitracing.com/search/Year/1969/Make/PLYMOUTH/Model/ROADRUNNER/Part-Type/Headers/
Just tryin' to help. grin


"Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing."
Robert E. Howard