Stuck pistons/Crank, any ideas?

Sounds like the rings are rusted to the cylinder walls. There's a product called PBlaster at most any auto parts store. Get several cans and soak the cylinders. Get a block of wood and a hammer and smack the piston tops. This will help get the PBlaster into the ring area. Let it sit for several days repeating the process everyday. It will come loose. You need to bolt a couple main caps back on so you can try to rock the crank back and forth after it's sat a while. It's gonna take some time.