richardwv;
              I have just recently finished a Peabody rifle,using a CF action, the striker block you refer to I assume you mean block with rimfire firing pin--the firing pin is made with a rather long sharp dog-leg that would be the hardest part of the conversion. There is a groove [guide] cut in the side of the block for the firing pin, which may create another problem, other than this firing pin problem the rest of the conversion is fairly easy for any good gunsmith.
                If you need wood, Treebone Carving has a very nice stock set for the Peabody--The Green Mountain full OCT barrel--1.08 muzzle & 1.20 breech --fits the action --making the rifle just over 12pound. good luck with your project
   PEABODY'S forever               leadball