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Under what circumstances is the engine overheating. At idle in the garage? Driving.
Confirm that thermostats are working and you can see full flow into the top tank, looking through the radiator cap opening. Does the fan have a shroud. If not, they can be ineffective.
If the new rebuild was put together a little tight, the engine has to work pretty hard, especially at idle. You need to get that break-in under some load, like accelerating and decelerating at highway speeds.