Yes, that's an 1101 carb you have there. It was fitted to the large log heads. With a higher flow rating than the 1100 it's a bit of an upgrade. One of the channels in the bottom flange supplies vacuum to the choke hot air tube. Just like in the 1100, there's a passage that wends its way from the 1101 carb base, or the spacer for an 1100, up through the carb body, and out through the choke housing to the choke hot air tube. It's a permanent small vacuum leak, I guess the size of the passage regulates it. I'm not sure about the second passage, I imagine it's for vacuum up in the carb for one reason or another. I wouldn't assume it does nothing.
Vintage Inlines sells an adaptor to fit a large log carb like an 1101 onto the small log 1.5" opening. I've seen them on eBay too. You can make an adaptor out of an old spacer, but the larger base on the 1101 complicates things. Even before you enlarge and taper the spacer bore there isn't enough width on the top rim of the spacer to cover the big 1101 base. You need to support the gasket and seal those worm track vacuum passages on the bottom of the carb. A simple sheet steel big "washer" can be made by tracing the 1101 gasket onto some scrap metal to sit on top of the spacer/adaptor and provide that support and fill the gap. Use an 1100 gasket between the bottom of the plate and the now tapered carb spacer. One problem with enlarging and tapering the bore in the standard small log spacer is the water tube though it. The wall is kind of thin on that side and it's easy to break on through. A more forgiving starting point is found with the 1968 version of the spacer that has no water pipe. It's probably a lot easier to just spend the money and buy the Vintage Inlines adaptor.
The threaded through hole in a cast in bracket kind of where the SCV would have been is for a dashpot to slow the throttle closing at idle. Kind of like the second diaphragm on the 1100 carb for automatic cars. If you need/want one you can find them NOS on eBay, there's probably someplace to buy them new too. The threaded hole just forward of the dashpot bracket is the distributor vacuum source. The plain brass tube above them is the clean air supply for the choke hot air tube. It runs to the bottom of the exhaust manifold, the choke hot air tube goes in the top. Looks like there's a screw in your manifold's choke hot air port. I don't think anybody makes that bottom tube anymore, Ford didn't bother with this feature in all the years using 1100s. I wouldn't worry about it. Just cap the pipe on the carb for now. And the higher choke housing on an 1101 compared to an 1100 choke means your old air cleaner probably won't fit the new carb. Air cleaners for the 1101 have a dent in the bottom plate to clear the choke.
