86 toy 4x4 overheating probs...Help!

the water pump on my 22re went south...it got hot but i think i got it shut down before it did any other damage. changed the water pump and the thermostat and lat it run for about an hour to check for leaks and see if it got hot again no problem until i decide to drive it up a nearby hill and check it under a load sure enough it got hot again...is there anything it could be besides a blown head gasket...theres no oil where it shouldnt be and no antifreeze where it shouldnt be starts and idles just fine ...any ideas thanks Charlie

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Charlie DeLorme
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