72 Duster: You can lead a horse to water, but...

Thermoquads have rubber seals that a known to fail just sitting on a shelf.... Pretty easy fix, it's worth a shot...

Part...
https://quadrajetparts.com/primary-well-seal-ring-p-881.html

Info...
https://www.web.imperialclub.info/Articles/ThermoQuad/Page11-big.jpg

Lots of pictures...
Carter Thermo-Quad Service Manual