Anyone using the Ford rear disc kit from Currie?

I've never had an issue with it.

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That's a really good question. Currie will supply a Lokar e-brake kit. Reputedly, they are not easy to adjust to eliminate drag - at, least, that is what I have been told. I will likely opt for a solinoid-driven actuator that splices into the rear brake hyd. lines. When a switch is thown, the pads lock to the disc. No e-brake is used, but an e-brake function is obtained.
 
Mico had a brake lock set up like that

Not sure if they still make them. We had one in a construction truck. To be honest, I didn't like it much. Granted this truck was really used hard, but it just wasn't something I'd rely on for extended periods.
If the P brake is a cable setup it shouldn't be hard to fab up. I did a setup for the Cobra brakes on my '66. The only thing I'd do different for a coupe or fastback is eliminate the eyebolt, and fab up the correct length adjustment bar with a bearing support. I've got a couple of pictures on the web page in my signature of what I did. It may give you an idea of how you can do yours.

HTH,

Scott