Used to see these with block-off plates on the two center carbs.
The manifolds were made by a number of manufacturers.
The block-off plates were cast, and carried the name of the manufacturer.
If the two centers were blocked-off, the manifolds took on some of the characteristics of a modified IR manifold. Later IR manifolds (early 1960's) used four Weber two-barrels. Generally, the folks that used the logs used either Stromberg EE-1 carbs or Holley AA-1 3-bolt mounting carbs; although I have seen a couple of these that were either factory or user-modified for 4-bolt mounting, such as the 2-G Rochesters.
The folks that couldn't make them run would have been better off with a 4-barrel, or maybe learning to synchronize multiple carburetors.
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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