I assume the BC braket was reversed engineered from an original bracket, so it should work with the slight tweaking suggested in EB6677's excellent article.
I don't think "reverse engineered" is quit right. I think closer to re-engineered. The stock bracket makes the booster and M/C sloop down in the front making it necessary to dent the inner fender on all except the 76-77's and the stock boosters were getting hard to find so I started over. I designed my bracket to make the booster and M/C set flat and I used a 78 Mustang II booster because they were easy to find. Later the mustang boosters got a little hard to find so I had new boosters make with the same bolt pattern and bellcrank connection as the Mustang II. So, the stock EB booster will not bolt to my bracket and the bellcrank connection is also different. Anyway, I am developing a hydroboost brake kit right now and have the mounting bracket out for bid right now. I will be selling a complete kit and just the bracket so you can go to the boneyard and get the booster and pump. It usually takes 1-2 mos. form bid to product on the shelf so I don't know if that helps but thought I would let you know what was coming before you started spending money and modifing parts.