help! coolant not circulating????

[mxerchris]

On pa-inlaws 69 w/350 temp gauge was pegging out he didn't think the truck was really getting that hot so he replaced the sending unit thought that it was fixed but after a couple short drives realized it was running hot so replaced the thermostat still not fixed hot water in upper hose cool water bottom hose so thought radiator was stopping up, he said let's go ahead replace it with an aluminum one, put it in still running hot?? It had an edelbrock water pump so thought maybe it was no good replaced it with new pump still doesn't circulate??? What could cause there to be blockage?? By the way could not get the bottom hose (old one or new one) to not leak at the water pump even with 2 clamps. Any help would be appreciated
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