TQ questions

I can offer a few bits of info but I never got Thermoquads figured out for my purposes.

The 9811 is an aftermarket performance version that wasn't available as OEM on any cars or trucks. That "family" includes 9800, 9801, 9810 & 9811. Depending on the overall condition, that may be the best one to build. More knowledgeable people can offer more or better advice.

https://www.retrorarities.com/images/CarterThermoquadInformation.pdf