The two barrels fitted by GM to these engines were of the 2G series. For these engines, 2Gs come in two major varieties 2GC and 2GV. The 2GC has an integral automatic choke control mechanism (C means choke). The 2GV has a vacuum break, which pulls off a choke as set by a manifold mounted thermostat. This is the divorce mounted thermostat, typically a bi-metallic spring coil in a well located in the exhaust crossover (2GV means vacuum)
I did put something here, but it vanshied, I think
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