New motor, coolant temp creeps up between 195 & gets close to 230

So I had my motor rebuilt and I am in the break in process. Engine seems to run strong however the temp creeps up between 195 & gets close to 230 so I am trying to problem solve it. It is not puking coolant when I turn it off and I do turn it off when it gets to about 220 as I fear the temp will keep rising and do damage. I think the vacuum advance on the duraspark distributor is engaging at idle when it should not be because the temp kept creeping up at idle. I already changed out the vacuum module. If the vacuum advance is advancing at idle I suspect the timing will affect engine temps. How many miles on a new motor before I can pull a spark plug to see if it is running lean? I have the correct thermostat style and it is 192 degrees. Seems like the issue arises after being on the freeway a while and then getting back on side streets? So my plan is to check timing at 1000rpm with vacuum advanced plugged, then drop idle to 7 or 800 rpm and see if vacuum hose is sucking and if not reattach hose to vacuum module. Also pull a plug and inspect it's condition. Other than that open up air fuel mixture screw a little if the plug looks clean or white. Can also be a faulty resistor at my temp guage? 

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