Stuck pistons/Crank, any ideas?

First, I unbolt the rod caps and take the caps off. Then, I beat the snot out of them from the bottom using a peice of steel tubing on the pin bosses. They will break lose and you are not using the pistons again. The problem you may have is the rust pits it will inevitably have made in the bores where the rings were stuck. Remove the ones you can reach first, then one by one the oter ones. Also, never beat DOWN on the pistons... It's a good way to possibly mess up the crank, rod, or cylinder wall. Always hit them UP the bore.