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stewart makes a good hiflow thermostat, they also have a lot of helpful info on their website. i've used the stewart thermos with 3 holes and that is a bit much, engine doesn't get up to temp cruising down the hiway.
i put a fan in front of the radiator whenever i'm working on engine stuff while it is running, helps to cool it off when shut down also.
watch your timing, and i wouldn't richen it too much. if you are late on your timing and putting too much unburned fuel through cylinders into the exhaust your headers will glow a brilliant red. a temp gun might be helpful in this situation.
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