The problem with trying to drive one piston down when all four are stuck and still attached to the crankshaft is that the crankshaft is transfering the energy to all four pistons, so by pounding down on one, you are trying to move all four.
If I were in your shoes, here is what I would do. (I had to do this with two badly stuck pistons in a Farmall Regular engine) Remove the connecting rod cap and then drive the piston/sleeve assemblies out the top of the block. Put the sleeve/piston in a press and put some pressure on it, you can even heat the outside of the sleeve with a torch a little, the heat will help loosen the rust bond and draw the penetrating oil into the tiny spaces. If you don't have a press, just set the sleeve on a couple blocks of wood and hammer on the piston with your oak block and 10 Lb. hammer. I bet they will come loose without too much trouble. The pistons have to come out the bottom of the sleeves anyway, so just drive them all the way down and out.
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