500+ is a lot of horsepower to stop. These cars came from the factory with 11" brakes and half that amount of power.
Now, a lot of it depends on what you decide to run for tires up front. If you run skinny little hockey pucks then 11" brakes will probably do as much as your tires are capable of. That said, I ran the later 11.75" B/R body disks on my Duster with 225/60/15's up front and thought they were great. Same brakes I used on my Challenger for years, they did well even with the 275's I ran up front on it.
The Stage II kit that DoctorDiff sells is basically just the factory 73+ spindles etc with the later B/R body 11.75" brakes. They fit with 15" rims too, not sure what you've decided for wheels. But all factory reproduction parts, and a nice upgrade compared to the 10.97" 73+ disks.
