Back in the day, about 1978 or so, my step father added power brakes to my B-body dodge. As I remember he had to change the push rod and add the booster. My guess is that going the other direction would be pretty much the same thing.
google of the part number revealed this page.
http://www.mbmbrakeboosters.com/index2.php?option=com_yanc&act=archive&task=view&cid=10&Itemid=164&no_html=1
yeah, make sure the guy on the brake pedal know what he is doing. most auto parts stores sell a hand pump vacuum kit to do it yourself. worked good on a motorcycle for me but haven't tried it on a car yet.