Sherwood pumps on my 68 cavalier

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Hi All, I have had some overheating problems in my left engine, usually after shut down and then starting up again, at idle or low speeds the temp goes up and over heats, if I run at high speed the temp comes back to normal, and I can idle all day long as long as I dont shut off again, if I do I have to get up on plain for about 30 seconds to bring it back to normal. I have the pump apart (sher-wood brass co Q10780 V4) and it appear to have two brass gear type impellers, having a hard time locating parts, is there an upgrade that would bolt right on? thx,