The Early V8 Garage bracket is nice.
www.earlyv8garage.net/
You will also need something to route the cable to the center of the car if you want to pull equally on both rear brakes. He also makes what you need for that, and that bracket is not trivial. Both of my 32s have his bolt on brackets for the master cyl (which uses all stock holes) as well as the E brake kit. They work well and are professionally made. If you consider the time to make these properly, I believe they are a bargain. These kits can be installed and removed without harming anything stock, including the brake pedal. I would encourage you to look at his products.