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The pictures help. Take note of the pictures aerohead posted.
I don't see a problem with the hose being exposed in the duct. It's easier to reroute the water than the air. Consider a 90° elbow and cap at the pump outlet to give a clean run of hose forward.
I think the bigger problem is the original radiator header. Maybe cut it out and replace with a piece or pieces of round tubing? Or make a duct floor that is stout enough to replace the header. (It's pretty important to the integrity of the front end sheet metal)
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