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what pump and regulator?

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Mallory 140 pump. Mallory return style regulator.

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I would call Mallory and ask them about using a return line on that pump, I don't think it has enough power to feed a good size motor at WOT and use a return style regulator I hope I'm wrong I have used that pump before on a stock stroke 440 with 906 heads and a single four barrel set up, 2 3/8 feed lines into two Fram fuel filters Y into the pump #8 line to the Mallory two port regulator they recommended, that set up was marginal on that combination