Freeing engine;
If the engine is just stuck from sitting & there is no great evidence of rust on the plugs you might try putting some oil or penetrating oil and some Oil of Wintergreen in each cylinder. Let it stand for as long as possible then carefully try to rotate the flywheel either way with a good pry bar on the ring gear teeth from below. You should first remove the rocker cover & see that all of the valves are free - The older Chevrolet engines tend to stick their valves, then on getting the crank shaft turning the push rods will bend or the rockers can break.
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