I've got the underhood area disassembled for engine detailing and am considering trying to add a power brake booster to my manual drum brakes. Can this be done without major modification while still retaining the factory appearance? I am not converting to dics so I do not want to make any changes to wheels or suspension. I would also like to retain factory authenticity. Can it be done and what parts do I need? Thanks, in advance, for the advice.