Mines right beside the brake master cyl under the drivers floor. It's not the easiest place to put it but it keeps all the pipes neat and short. Really great improvement to the feel of the pedal, and much better stopping power. One word of caution though, make sure you get a booster designed for drum brakes. One from a hunter (old model) will do it. A VH44 is the one you want
Have a look at the iceman thread and there is a pic or two of the setup.
http://66.129.69.181/forum/topic.asp?TOPIC_ID=3161&whichpage=4
I just need a good rootes...