Frank, I've had the same problem. The way I finally got my flywheel off was, for about a week, I squirted WD-40 around the flywheel/crank flange every time I walked by the engine. (I wouldn't hit the flywheel with a hammer, unless you've got another one to use) Then, after that I got two rolling-head pry bars and simultaniously pryed on the flywheel in a rocking motion. (they provide a lot of leverage) I was prepared to use heat (last straw) but after keeping this up for a few minutes the flywheel began to loosen, then, finally came off. Be careful not to damage the back of your block, as the casting there isn't as thick as you may think. Hope this helps.
