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If you're getting heat, then pull them out. The pair of them reperesents a fair amount of weight (relatively speaking). I added a set to my early car because there just wasn't enough airflow with only the air coming from the main blower, especially for defrost when the motor isn't at high revs.
My shop wired the setup through the two-step rear defrost switch, so I have high and low speeds for the kick panel blowers.
That engine bay looks sweet!
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