When the head gasket is installed backwards the engine makes an interesting gurgle & surge sound as its running.
The other possibility is you have a Weiand or Milodon water pump in which the recirc passage has not been drilled out. That usually results in a pulsating temp gage as the engine warms up. The gage swings quickly from cold to hot, and then back to cold again. Over & over several times until the engine reaches operating temp.
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