I am gonna disagree with JB here, cause I just feel like being a little bitchy and want him to be really wrong just once in his life. (OK, he is probably right on this) But, I think the 350 brake will be just fine on the street for you. Especially if you take the time to set it up so it is working as well as it can. To start with, If it has usable shoes that are already mated to the drum, I wouldn't replace them or turn the drum. I have had really good success with sanding the shoe friction surface fairly agressivly and sanding the drum surface only to make sure that any crap is off it and you have two good surfaces. Then go through the usual stuff like lubing shafts, checking bearings and adjusting engagement. Give it a try and look for something even more trick for later. Cafe bikes are always a work in progress.
Vintage racing - old guys on old bikes