The following was provided by Ken
I have to admit that this has been one of the most difficult areas of research I've ever come across. I thought I was well on my way to bottoming this when I assembled the research on carb types and then asked for input from other mutt owners. I discovered that there were several types of carb....the first (non-Holley) was the 10939511 (the 12848 carb). Just about every reply indicated that this was an adjustable carb (with external screw) and was used from around 1964 to 1969. Next came a fairly obscure carb...introduced for the Ford A2 and continuing onto the AMG pre-emission A2. This was the 11641105 (the 13841 carb)...again, external adjustable.
With the introduction of the emission-controlled AMG A2 model, the 111681709 was introduced....but there are THREE versions of this.
First was the 13360, then the 13660A and then the 13660B. The plain 13660 was a "sealed" carb (tamper-proof screw). The 13660A seems to be a mix of sealed and adjustable versions. Then the 13660B carbs all appear to be sealed. I think I speculated that the plain 13660 carb caused so many problems that the "A"-version was introduced (presumably a bigger jet???). Then the 13660B was introduced as a "one-size-fits-all" for use on M151, M151A1, early M151A2 and emission-controlled A2s. I could be wrong!!!
However, the next big problem was in trying to identify the correct repair kit for each carb. I quickly discovered that for several years, the Zenith was classed as non-repairable and presumably was just thrown away. Then there was mention in "PS" magazine that DS/GS could now tackle repairs to carbs. So far, so good. But surprisingly, some "repair kits" listed in the 34P parts lists actually INCLUDED a new carb.... they weren't repair kits at all....they were in fact new carbs with associated mounting hardware.
The next, and so far unresolved problem was the gap in my DS/GS tech manuals. As you now know, I am still looking for eight 34P manuals which (I hope) will list the FSNs of the various repair kits. That's the theory anyway!
To end the story, I did get some additional feedback but without the missing TMs, I haven't been able to verify what I was told....but here it is anyway:-
"Clean air carb - rebuild using kit 5703307 but DON'T use the diaphragm assembly #11630415 or power/acceleration jet washer #T56-32. Use old parts".
From the 20P Ch.3 Aug-71...."New idle mixture screw C46-57 5305-182-9467".
From the 20P Jan-72..."Mixture adjusting screw also includes seal & washer plus spring & needle screw".
From the 34P Jan-70...."2910-176-8873 - Carb kit 5703381 - includes carburetor 11641105". Ken
Note: Holley carburetor was discontinued on new vehicles in the beginning of 1964
New Zenith 13660BZ Carburetor. Used on US Army M-151 MUTT Military Utility Tactical Vehicle - Jeep and others. Wholesale priced for Mechanics, Business, and Resellers. Made in USA. 1 year warranty.
They also have complete new production rebuild kits available. You will also need to order one gasket separately for the emulsion jet that screws into the bottom of the bowl. It is not in the big kit that they sell for some reason.