Carter was the original equipment carb on Chevy engines for a long time until GM started to build their own carburetors in the early 1950's. I believe a Carter YF for a 258 cubic inch International/AMC/Jeep 6 cylinder engine would be just about perfect for a 261, or maybe the same carb set up for a 300 cubic inch Ford six, which would run slightly leaner than the AMC carb when used on a 261.
Jerry

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