When you fitted your new engine, did you clean out the heater? A lot of crap can accumilate there. There is a possiblility that it could have come from the enging, but I would doubt it. The 'slim'could be from the coolant you are using or some residual de-greaser from the engine reco.
Regards your engine temp, check it against something accurate (capillery gauge) before worrying too much about it. Also find out what temp thermostat you have in it (88 degree ones run about where yours is - 82 deg run about mid way).
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