Will 340 exhaust system fit 318 (1971 Duster)

We have a repair shop in Topeka that does a lot of work on classic/muscle cars. They have a long and great reputation for not only doing amazing work but taking great care of the cars while they have them. It is about the only place I will leave my Barracuda and pick it up later. They do amazing exhaust work. They could easily do a good job on your car. Maybe you could find a local shop like this one to do your exhaust work.