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It shouldn't matter, right? I mean, it will flow through either direction.
But I believe the OEM setup has the line from the thermostat on the block going to the lower heater core line and the line from the waterneck on the head going to the upper heater core line.
Also, I found another P12 difference. The timing marks on the pulley aren't the typical -5,0,5,15,20 BTDC, there's actually only 4 marks, which appear to be -5,5,15,20 BTDC since there is a gap where I would expect 0 to be marked.
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