God knows that I am no expert on this subject, but it is my understanding that you will want a mono cart. with a spherical profile stylus and a phono pre that has the many different equalization curves used during the 78rpm era and a good and adjustable rumble filter. Something like this:
http://news.thomasnet.com/fullstory/stereo-phono-preamp-restores-78-rpm-records-17127
http://news.thomasnet.com/fullstory/stereo-phono-preamp-restores-78-rpm-records-17127