I would say waterpump, but unless it's been sitting for a long time it's probally been replaced...... and the radiator will more than likely either need to be pulled out and rodded or replaced, it's highly unlikely that the previous owner flushed it from time to time or kept it full of antifreeze. That in itself is a problem.... the original freeze plugs in the block are steel, they like to rust out.... check them, two in the front.... three on each side of the block..... there's two in between the engine and the tranny too but you can't check them, you have to pull the tranny to replace them.
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