Who rebuilt the bottom end? Originally the stats gave the wrong torque for the head bolts, so if they were not tightened down enough your head gasket could be leaking or worse. ive been told that a lot of 86's had blown head gaskets a couple times over until toyota realized the mistake. if a shop rebuilt and didnt know about this that could be your problem.
any leak or whole in your coolant system could cause overheating. When you loose some pressure your boiling point drops and car overheats. mine was overheating... head bolts were not torqued down evenly by the person who put it together last... so i am in the middle of a bottom end rebuild and gasket replacement myself.
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