Curt - possibly, it would depend on the shape of the plenum. If the plenum is of sufficient size that the air/fuel from both barrels of the carburetor could enter the plenum with no restriction from the walls of the plenum, then the design should work. The air/fuel entering the plenum from the carburetor should NOT be restricted.

As to the height of the carb flange (or the distance from the plenum to the throttle butterfly): the optimal distance will vary based on the use of the engine. An engine for a truck (good idle, good low end torque) would have the carb flange very close to the plenum. More power at the high end of the RPM range (AT THE EXPENSE OF LOW END TORQUE!) may be obtained by raising the carburetor (eg. tunnel ram intakes). Raising the throttle butterfly in effect increases the volume of the plenum, and helps minimize individual cylinder pulsing.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop