Well, I only have one head off and I already see what my problem was. The guy I had purchased the Mustang from had rebuilt the 351C that is in it currently. However, even though the head gasket is clearly labeled, it was installed BACKWARD! By doing this, it completely blocked off one of the water jacket holes from the block into the heads. I can only imagine that the other head is similarly affected. At least now I know what exactly causes these types of problems, and will hopefully be able to tell anyone else in the future. Thanks for all your help.
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