I'm completing this build now on my 91. I got Wilwood Combination Parking brake calipers, manufactured my own brackets and also have two piece Wilwood rotors. It was a heck of a project, but it looks fantastic and will allow the car to have a sleaker look and much better stopping. I'm working on an L67 conversion with a massive power output....need all the stopping power I can get! I've also beefed up the suspension with Moog chasis parts and an Addco 429 sway bar in the rear to keep it planted.
Keep in mind that you will have to address the master cylinder, booster and a proportioning valve too to maintain the proper braking force. It'* a lot of trial and error, but is one sweet customization!