According to the schematics, there's an orange wire that's spliced that provides 12V to the choke heater, bowl vent solenoid, and idle solenoid.
The choke heater and idle solenoid uses the carb as ground. The bowl vent has its own ground and can be deleted.
Jeepasaurus (Wagonus Grandi quadropedus)
88 GW 360-.030 over/2150/727/229/Posi, e-pump, AC (broke), tow package, Monroe Air Shocks, TFI, CTO-Free, AIR-free, oil & tranny coolers, dried knuckle blood all over, GM 350 TBI in a box, waiting...
"You're an FSJ'r when the parts guys memorize your name, phone & credit card#."