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IMO no, I'd replace it in a heartbeat with a new/better one like a Carter HP unit but then again I am not a purist and don't care about originality.
Its a consumable item like belts, plugs, etc. You might want to put it away in case the next guy wants it but I don't think the original pumps are rebuildable, could be but I don't think so.
What is the date of production? Numbers on it? Even those who are not purist's, end up with purist cars.