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I recommend backing off timing, and richen it up a bit and see if it changes any. You know the cooling system is flushed, and without a thermostat in there it should definetly be running cool if the motor is stock/pretty much stock. I'm not too sure about mileage on the motor either, but mineral build up in the cooling jacket from lack of coolant maintenance or using hard water could be hurting your cooling system efficiency.
Another thing, not sure how your fans are set up, but the one in front of the rad should be pushing air back towards the motor, and the fan on the back (inside the engine compartment) needs to be pulling air through the rad.
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