76 Noric has a good plan too. Though I beleive in PB Blaster. Used that sheit when I lived back east on rust crap, worked like crazy. Only thing that did. In the end, don't break anything, but spray it down, smack it abit, and repeat. only want to get it out and not break anything. The twisting with a pipe wrench, well, sounds like a good idea, just dun crack the block.
Ray