Without wishing to create an argument with Mike, It *is* possible to fit a top hung pedal box, I've fitted one of these;
Tilton Engineering - Brake, Pedal Assemblies, 2 Pedal 3 cyl
I have superb braking, the pedal ratio is 6.2:1. I have no servo & use AP four pot calipers with 304mm discs front & rear. However there is quite alot of fabrication involved.
Regds,