If you've over heated it that much chances are you've warped the head.
as far as causes... the headgasket would not be one of them...
the only things that are gunna make your car overheat are..
1. the coolant is not flowing.. this could be because of a water pump, an obstruction in the cooling system, a falty themostat (frozen shut),
2. ineffective radiator. (you got it replaced so...)
It sounds like the water pump...
You should check to make sure the upper and lower hoses are approximatley the same temp. IE if the top is welding hot and the bottom is cold then your not circulating the coolant.
other than that I'm at a loss.
good luck.
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