The Johnny bolts are the rusted ones. I had to use a hacksaw blade just to get the nut off to remove the toilet. I would like to remove the flange but my big issue is that it won't some off. Are cast iron flanges typically bonded or soldered to the drain pipe if that is also cast iron? I don't want to get too aggressive and end up damaging the drain pipe. Any recommendations?
You can keep the existing flange and do it how Alan said or you can get a metal flange with the higher hight they do make them you can solder together.