Jerry,
My opinion only - while I offer the Holley/Ford units to those who demand them, I certainly do not push them. I personally do NOT like the design of the power/economiser valve.
The initial cost is much less than the Strombergs, but they can end up ruining your engine.
On a built 261, I would suggest two of the Stromberg model EE-1 type 97. These were used on 1935~1938 Ford 85/100 HP engines. Resist any suggestion or urge to buy the newly released "knockoff" which is being sold at $299.00 new.
As to identification: the Stromberg 97's have a 97 cast into the side of the bowl. The Holley/Fords generally have a group of letters/numbers cast in to the side of the bowl which relates to the Ford engine type.
Chandler and Groves were two disgruntled Stromberg engineers that formed their own company in the mid-1930's. I am still not clear if Holley helped them set up the company, or just bought them out in the late 1930's. The Holley/Ford type Model AA-1 type 94 is a Chandler-Groves design. The very earliest AA-1's are marked Chandler-Groves. Most of the later ones are marked FoMoCo although they were built by Holley.
Jon.
