I got word from my mechanic yesterday that the carb went back together well, except for one small hitch: the gasket they sent in the rebuild kit (Walker 15821A) is too thick for this application. Apparently I have a heated choke (as opposed to manual or electric) which means the choke is actuated by the temperature coming off the manifold. Some good information on the various methods of automatic choke actuation can be found here, as well as some Thermoquad-specific information here.
With the thick supplied gasket installed, one of the linkage rods isn’t long enough to reach, so he had to call around to find the correct gasket and have it overnighted for tomorrow—which is great, because we can’t pick it up until tomorrow evening anyway.