"which direction does the pump push the water, up the radiator, or pull water from the radiator to the block?"
Take a look at the illustration below.
Note the illustration above shows a Model 70 Diesel; however, the flow of the coolant in the cooling system will be the same for the Model 70 gas tractor.
"Also any way to check if the water pump is okay before pulling apart the upper water pipe to get at the thermostat?"
When inspecting a Model 70 for possible purchase, checking the cooling system is usually one of the last tests.
After the tractor has run and has been driven for quite some time, I briefly put my hand on the upper water pipe to "feel" the heat.
Then I hold my hand firmly on the lower water pipe to "feel" the heat.
The lower pipe should be comfortably warm.
Next step is to remove the radiator cap and see if the coolant is flowing.
By no means a guarantee the water pump is OK, but should be a good indication that it is working.
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