Time to give up on the Thermoquad?

I agree with RF, rebuild it. NAPA can get a kit for you, I would suggest replacing the floats as well (sold separately). Check the bottom of the wells, the little plastic piece, you might want to pull them off and re-glue them in place using some good epoxy. There are small O rings in the bottom of the wells, are they there?

I took an old TQ and rebuilt it and it runs great on my car.

If you do rebuild it, pull the wells and put them back on with some good epoxy and let it sit for 2 or 3 days to fully cure before you put it back together.