You might try this electric set-up.
http://www.abspowerbrake.com/ElectricHPpage.html
Interesting concept. I found it on Lonestar Classics cobra (LS427) forum.
I'm just getting my car running and pedal pressure is so great I can't lock them up. May just need to broken in and balance bar adjusted. I hope that's all. I hope I don't have to boost the brakes.
Good luck
JT