How would choking a single carb help at all - especially since #1 (front) only controls the front two cylinders...or does it?

I intially thought that the choke was missing from #2. It had the pivot hole, but no choke assembly. Upon closer inspection, however, I noticed that the mounting points for the choke assembly on #1 (screw holes) were not drilled out. They were solid cast. This led me to assume that there was no choke for #2 - since it could not be attached like it was for #1.

However, in looking through the manuals, I noticed that the choke is suppose to do more than just open the throttle, but that there was some sort of mixture adjustment-thing internal to the choke. This concened me a bit, so I examined the pivot hole on #2 a bit more closely. It's not just a blind hole, there is a smaller circular hole in there, but I'm not sure what it does.

This led me to think that it might have had some sort of modified apparatus in there, but now you tell me that the early HIFs did not have a choke on the second Carb. That's fine with me, but what's that small hole doing in the pivot point. Should there have been a plug or something in there? Also the #2 had the "arm" for holding a choke cable, but unlike the #1, there was no clip present. The two carbs were so uniformly covered in grim, that I'm sure that nothing has been recently removed from the carbs.

So, it seems that I'm close to ready to test these things. My Amazon is completely drained of oil at the moment so that I can attempt an oil pan gasket replacement, so I can't get them on just yet. As long as the weather holds, I'll attack this over the weekend.

Thanks.

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1967 P220 Amazon, 1972 145S, 1976 245 DL, 1983 245 DL, 1986 745 GLE, 1990 745 GL, 1995 945....
You mean to tell me that Volvo makes cars that are *NOT* Wagons?!?