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Was the old "freeze plug" (casting core plug) removed or knocked into the head?
Plugs knocked into the head can clog or block the water flow.
There may also be rust or corrosion in the water passages that needs to be flushed out of the system.
 

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Active Jeeper
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The causes for overheating can be diagnosed fairly easily (in most cases) by following the troubleshooting methods outlined in most 'competent' service manuals.
Any debris left in the system from a past service or accumulated over time from bad or old coolant/hard water will wash into and restrict the narrow passages in the radiator and heater core. Some radiators are beyond flushing when the internal blockage build-up is immovable. This can greatly reduce cooling performance if everything else is in order.
I was tardy in checking back, my comments regarding flushing, were incomplete, I was referring primarily to flushing the block.
When i rebuild motors, you cannot believe the amount of crud I find in there, up to and including core plugs and casting rod pieces, along with an occasional 4 lbs of rust.
 
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