After searching the internet some more, it looks like all the tags identify is where it was made and for what industry. So, in your case tsx says it is an agricultural carb and the numbers 159 and 422 are code for the different locations where each were made at. If your concern is stepping down in cfm you are already doing that if you have a true original wd manifold from a 201 engine on a 226 wd45 engine. The wd manifold originally had smaller ports than the wd45 manifold. A new replacement today for a wd today is now the larger ported manifold used on wd45's.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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