I haven't heard you say that you know it is frozen, just wondering. I don't think an engine bay fire should cause the engine to freeze. But sitting around for 5 years could do it. I would do as I suggested, pull the inspection pan off the flywheel and put a heavy screwdriver onto the teeth and give it a spin. If you can't move it that way, I would plan on a tear down to see what's left. It doesn't cost much to do a simple rebuild on that motor and you may only have to bore and replace pistons and rings anyway. Don't make it worse by breaking rods by pushing it.
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