There are adapters around for BA Falcon front brake calipers. I fitted those along with a BA rear brakes, brake master and booster. I went this route for ease of engineering as it was a complete brake setup proven to work.
That said, it was definitely a bit of a fuck around to get the booster in. I cut off the rod that goes to the brake pedal, threaded the shaft and put a clevis on the end. The whole booster is also spaced off the firewall approx 25mm with a plate that picks up the bolts that hold the pedal box to the firewall.
I put it lower down on the firewall compared to the stock booster. I run out of stroke in the master before the pedal hits the floor. Only driven the car once so far but I get the sense that for pedal feel it might have been better not to put it lower. I was just trying to get as close as I could to the same pedal ratio as a BA Falcon.
Happy to provide more info if you are silly enough to go this route haha.