Frozen Block

Any tips to getting a “frozen” block apart? Trying to save this 230 block for my stroker as my 1st block is about 3 thou too large and my 2nd block turns out to have a crack. Found this block a couple hours away and its the right year but in tough shape, lol. Been soaking for a few days. Popped one of the rods I could get to but piston is not moving too easily even with a block of wood and a small sledge. Trying not to make things worse. Any tips? Thought about running a little Mapp gas torch around the ring land.