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Why are you running a 165 degree thermostat? For optimum performance, fuel economy, and engine longevity use a stock thermostat not a colder one. All that will do is make the computer think the truck is cold and it will run rich.
Um, doesn't a Mark VIII have a Modular overhead cam motor? I think you mean Mark V, right? Look up a fan swap thread. Maybe in the FSB forum. That should get you headed in the right direction.