If you are talking about single or double servo, can you send me a picture? I've forgotten I think you have a Mk2. But you could still have a single servo.
The clamps are useful for not just isolating a cylinder, but by moving a clamp from one end of the hose(s) to the other, in case there is some bulging. There is quite long run on the fronts with those two hoses.
Remember not get caught out, if you have recently run the engine, then the residual vaccuum will help the servo to push on the brake pedal with greater effect. That can give the feel that it is going down further than you thought, when you tried it on another day without running the engine when there was no vaccuum.
If its any help, I think the total depth the pedal could travel to is about 5in, the best I can adjust mine to is just under 2in.