Many radiator systems are old, and insulated with my favorite substance, asbestos. The first thing I would recommend is contacting a local boiler company, (check your boiler, chances are the last service company left their name and phone number on the thing) and have them come out and make some recommendations.
Chances are you would have to have some asbestos abated ($$$) and then have the system drained so you can remove the radiator. Chances are also that you haven't had your radiator system changed (cleaned) in many many years, so the system could have some rather toxic looking water inside. This is not for the faint of heart.
Whether you keep the radiator (raise it) or eliminate it from the system is up to you and the recommendations of your boiler service man. Without having a lot more information, it would be hard to give you much more of an intelligent answer.
As far as hiring a qualified tech, ask for references, check with your state's departement of labor and industries or licensing to see his records (how long in business, liens filed against him or his bonds, etc). You could also go to some of the major remodeling contractors in your area to ask them who they recommend.