Street Demon or Edelbrock AVS2 or ?

The Eddys are an AFB style. The street Demon is a Thermoquad style. The difference is the secondary air door. The air door on the Eddy AFB is under the boosters. The air door on the Thermoquad and Street Demon is above the boosters. That's a huge difference. The Street Demon was designed right off the Thermoquad. They even look very similar.
Good morning Rusty, the OP was asking about the AVS2 series. On these, the air door is also above the boosters.