Lucille,
Have you tried Wrenchbender's method. The only way to remove the studs is to have a solid support under the hub. If you are trying to press or hammer them out without a support you will brake something. I broke a hub on my 54 doing it without a support. The hubs are cast iron. Mine had a small casting flaw inside where the flange broke.
I made a support with 3 short pieces of 3/4 pipe welded to a piece of steel plate. The pipes were spaced to support 3 lugs at the same time. The top ends of the pipes need to be trimmed to clear the tin shield. The good solid support you can hammer away without braking anything.
You will also need the support to install the new studs.
