[Rex Walter]

If you've never done this before - one thing Wayne's book doesn't tell you is that there are two dowel pins on the studs at the very front of the crank, by the flywheel. These help align the case halves. For me, getting these dowel pins to separate was what was holding the two case halves together. You might concentrate your efforts near the front (flywheel) end.

Hope this helps - Rex.