far as i can tell (thru some fruitless searching on this site thru threads that say they won't answer the question because it's already been answered) there is just the fuel plate stop: 2 half inch nuts on a threaded rod. loosen the outer [locking] nut, then tighten the inner nut - this pulls the rod outward which pulls the fuel stop back, thus increasing fuel.
there really aren't good instructions as to how far you should turn the nut in. some do a number of flats, some do as much as 4 or more full turns. regardless, make sure to keep the rod from turning as you adjust the inner nut; don't want to break stuff off inside the pump.
but, no, there isn't anything else regulating fuel like an afc or anything. there is a droop screw, but there seems to be even less info on that...