Honestly I think either way would work. The heater acts as another small radiator and the water is cooled and pulled back into the water pump either way when heater is on. I run with my nipple removed and blocked as you describe, and no heater at all.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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