I used this set-up:

http://www.ebay.com/itm/1953-1956-Ford-truck-Firewall-Brake-Booster-and-Master-Cylinder-pedal-Kit-/400323143049?pt=Motors_Car_Truck_Parts_Accessories&hash=item5d351e6589
This my install: It mounts on the rib on the firewall so the booster is not over the engine. The PO had it right above the valve cover.