I know there has been a lot of discussion about boosters for these trucks. I bought this one off Ebay for $225.00 delivered. Am very impressed. It bolts into the old master cylinder holes and to the frame. Has a bell crank installed to correct the pedal throw. The mounting brackets are 1/4" and 3/16". Has the correct combination valve for disk/drum or disc/disc, your choice. does not stick out from frame any more than stock. Includes a brake light switch. Definitely worth a look if you are doing a conversion.
http://www.ebay.com/itm/48-52-FORD-F100-TRUCK-POWER-BRAKE-BOOSTER-KIT-DISC-DRUM-/380691407755?pt=Vintage_Car_Truck_Parts_Accessories&fits=Year%3A1952%7CMake%3AFord%7CModel%3AF1%7CSubmodel%3ABase&hash=item58a2f9e38b&vxp=mtr