As Spinn noted, 1986 Chevy trucks could have used either the computer controlled CCC carb OR the dual-pump shot carb. The former is totally computer controlled. The latter is NOT, except for the pump shot solenoid. The look almost identical from the outside. Both have the two-wire electrical connector on the upper front passenger side of the carb. The CCC carb ALSO has the three-wire TPS connector on the front driver's side. Of course, inside they are easy to tell apart. The dual pump shot carb has conventional primary jets and metering rods. The CCC carb has the special spring loaded jet/rod assemblies and a solenoid that pulses them up and down.
You need to be completely sure of what you have. In 1986 the CCC carbs were only used on half-ton pickups sold in Calif. MOST of the trucks got the dual pump shot carb, so it is much more common. If you have the CCC carb, you're out of luck. The dual pump shot carb, on the other hand, can be made to run just fine on an early 350. The accelerator pump was set up lean for emissions, so the larger pump shot was only used when the truck was cold. If you recalibrate the pump shot, you can either leave the solenoid in place or put a plug in the hole in the float bowl. If you want to keep the dual shot capability, simply wire a toggle switch that provides 12v to the solenoid. The rest of the carb is conventional Qjet.