forgot to add yes you can add a yb head to a std pinto bottom end 205

also in my opinion if you did go the cossy yb route 200 block would be overkill if you ask me a std 205 lump should cope with 400bhp all day long
only difference in 205 and 200 block is some extra webbing around the crank area as the 4wd needed the extra strength due to the higher force acting against it