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About CFM: The Street Demon, the Thermoquad, the AVS/Thunder Series carbs, and Quadrajets all have adjustable air doors which will only let the carburetor be as big as the engine "wants" it to be.

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Not true on the AVS, the air door just replaces the counter weight system.

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Not exactly. The counter AFB's weighted air door is in the carb, under the top plate.
The AVS's adjustable air door is above the top plate and is adjusted in the same manor as the TQ. It will use two screw drivers to do. The AFB air door is adjustable via adding or deleTing the amount of weight of the counter weight. Not really adjustable IMO.

To the thread starter;

The TQ comes in two sizes commonly rated as a 800 & a 850. The small primary side of the carbs offer excellent drivability and throttle response. They have multiple ring boosters. Excellent amotimzation of the fuel.

The secondary sides are equal in size on both carbs @ 2-1/4 inch each side. The adjustable air door allows the door to open later on a more mello engine or sooner for a heavy breather. Engine size barley matters with this carb.

The only thing I can suggest is use the small primary (1.38) on 318/273 engines or a near stock 340/360. Use the larger primary (1.50) on 340 and up engines. Even better if the engine has some guts. (AKA Balls)

Tuning parts are really hard to find. I wouldn't use the carb if you do not all ready have spare parts to tune with.