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A cheap way to increase power on the 2.8 is to block the EGR. As the others have already said intercooling and big exhaust also help. After that you start looling at engine tuning.
With the overheating I would start with a professional radiator flush, check all belts and hoses and check the fan hub operation. Iwould also be replacing the thermostat but with a standard part. If the cooling system is functioning correctly on a near standard engine there should be no need for a colder thermostat.
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