Yes, in that image I posted the middle one (with 2 grooves) is the .091" opening. The one on the left side is .076" opening (which definitely came from a B used on a 235) and the one on the right side is either .100 or .110...something like that. I would have to dig up my notes. It was an aftermarket product of unknown make and age. Most of them had seats of about .091"...which is larger than the Carter, but the float bowl is larger on the Rochester.
Is .100" good? Well, the area is 20% larger than .091" so there's that. Area of .091" is .0065" and area of .100" is .0078". .0065" x 1.2 = .0078"
I will mention all the carburetors I straightened were also rebuilt and tried on my 1959 235. I tried one of them with three different jet sizes and then I tried the same carburetor (which was actually a BC model) with three different seat orifice sizes. And then all 5 of them were sold right here. Which worked the best? The smaller fuel inlet orifice (I had one which was something like .080" I had saved from the 1960s) and the 57 size main jet seemed to run nicer at idle and city speeds. I didn't try them on the highway. But no matter how hard I tried 3 of them ran richer than they should have. 3 had manual choke and 2 had auto choke. One of the BC models was a carburetor I had used since the early 80s. It wasn't too bad after I went totally through it, but there was no comparison to the Carter YF.
