I concur with Keith on this one too. Having pulled apart several of these motors in the past few years I can say that all the soaking in the world is pretty much useless.
Of all the motors I have ever done, the only thing that worked was to pull the heads, pull the crank, and then proceed to beat the pistons out, usually with a large piece of hardwood and a big hammer.
Don't worry too much about hurting anything because at this point it is about wrecked anyhow. Finding a good flatty that isn't seized is like the needle in the haystack.
About the only one I ever had in this as found condition was one that had been lubed up regularily and was cranked over from time to time to keep everything free. Even so, some of the valves were stuck and needed to be freed up before it could be test fired.
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