You can probably get the flywheel off by removing the pan, unbolting the main and rod bearings and pulling the crank and flywheel out of the block. You may also need to remove the balancer and timing gear cover. Or if you don't want to salvage the bell housing, drill access holes to the clutch bolts or just break the bell housing off with a BFH. It's cast iron and should break with a few good whacks.
Also if the cam gear is a fiber one, that can easily be broken loose from the crank gear with a prybar. But there's still no guarantee that the crank will turn if the pistons are rusted into their bores.
