I think the answer is "it depends". Usually a priming pulse will purge any air out. Dead head is not inherently bad, depending on how it's accomplished. PWM dead head is what I'd choose. (Haven't accomplished it yet on mine) When you talk about a return system supplying cool fuel, that's another it depends. It can in certain circumstances heat the fuel over longer periods.
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'65 Tempest 467 3650# 11.30@120.31
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