Basically, the selection of the port depends upon the flow rate through the CPU block (in liters per minute or gallons per hour or whatever units you prefer). So, it depends mightily on the hose size, the length of hose, the amount and type of bends in your hose, the blocks you use, and the pump you select.
For you, I'd probably select port #1. But, as psychofunk said, try the others out. Let us know what worked for you.
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