440 Fender Well headers ?

the strenght of your unibody isn't as much as a issue as the performance of the headers...

from my ol' Direct Connection manual...equal length primaries, around 33" long for optimum performance

I had a set on my fenderwell headers on my first Duster (Black w/Missle scheme pictured below)....in 1976...tubes veried more than 12" in length and some were over 50" long...and couldn't run much bigger than a VW tire on front.....they sucked!!!

that may be true on the 33" lenght but i have run almost every type of BB A-Body header. and went back to the fenderwells

the pro parts and tti's have so many and way to sharp of bends in my opinion.
by my butt-o-meter the engine liked the Headman's way better than the Proparts. and it runs cooler in traffice with the painted Headmans over the
ceramic Coated Pro-Parts

the other benifet in my opinion is spark plug changes are a breeze...