Yes. We'll said.
I have 2 HP Darts. One with fenderwell headers and one with Doug's. I have a 4-post car lift in my garage and was able to install the Doug's myself - with no help. The rest of the exhaust was on the car.
The fenderwell headers are of an unknown make and were installed back in the late 60's. Definitely a hack job. I would not recommend going this route.
Sell the Hooker's and get an Accurate Exhaust Products system. Kind of pricey but worth it. I think toolmanmike has the system on his Dart. They add just the right amount of rumble to the car.
Just my opinion.