vaccum lines
The pop sounds like it could be fuel related.Check and see if the vaccum line is connected to the fuel pressure regulator, the other posibbly could go to the egr valve.The overheating problem, did you install the head gaskets properly they should both say front and they have to be put on correctly or you will cut off water flow, or it could be the thermostat, timing, did you re check your timing after you reinstalled everything.
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