The M/C solenoids are listed as several different part numbers, but not sure if the ECM cycles any of them at a different rate?
The best thing one can do for those carburetors is to slot the adjustment screws for them with a fine hacksaw blade, and tap the airhorn for screw in plugs to access the adjustment screws.
In use the tuner has a pretty broad range of control over the part throttle A/F ratio by controlling the height of the M/C solenoid and plunger travel.
Those later ECM controlled carburetors are actually excellent units, but they are pretty "ugly" with all the stuff that is added to them. I can set them up for racing, etc, running them straight off the jets, but prefer to use early models for a "cleaner" look.....Cliff