If you don't want to do it yourself, and want a warranty on the rebuild, there are companies you can send it out to that will do it for you. One place that comes to mind is White Post Restorations in VA. They have a lifetime warranty on their rebuilds I think.
A lot cheaper to do it yourself if you can. But in addition to just getting a rebuild kit and lightly honing the bore, you really want to clean it up really good. All rust and crud needs to be cleaned out of the reservoirs or you will probably have your new seals get damaged fairly quickly. Also it is good to get the casting media blasted, and then paint it with cast iron paint, or coat the exterior metal surfaces with a good rust preventative so it will look good after installation on your car. Be real careful about not getting any petroleum oil or solvent in the bore, outlets, or reservoir. The EPDM seals used in brake systems are not compatible with petroleum and will be damaged if exposed to it.
