A clogged catalytic converter or a restricted exhaust will cause over heating. Also a cracked head or bad gasket. Also, if your engine timing is very far off it will overheat. Make sure you have all the air out of your cooling system and it is actually running hot, not just your gauge showing it's hot.
I hope this helps.
Could possibly be a head gasket, pressurize the cooling system and see if it holds pressure and for how long (only to about 15psi), and if the system holds, you may need to check for the presence of combustion gases in the cooling system.
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