I opened the non-working original pump motor in my '64, cleaned it and got it working like new. Bought a seal kit but was able to reuse the original molded seal between case halves because the kit included an o-ring, the molded seal not available apparently. IIRC, I also bought a couple other o-rings because the kit had the wrong size. I wasn't convinced the case o-ring would be effective so I cleaned the molded seal and it worked great.
I did buy new lift cylinders, I concluded they could not be readily rebuilt.
I liked keeping the pump motor original with proper p/n stamping even though nobody would see it. I cleaned and spray painted the exterior to mimic the look of plating. I think it came out great. The seal kit was cheap. But I would guess very few guys would be as anal about originality as I tried to be so likely would take the easier and more certain path of buying a new pump motor.
I doubt you could sell cores for much. If mine had been previously replaced I probably would not have sought an "original" and surely would not have paid even half of a new one for a core that might work after "rebuilding". JMO
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