If you're interested, you can go back to around this time last year and read my posts on the Rochester B and BC problems and some solutions. There are several things that can go wrong with a Rochester...and some of them can be rather serious.
Given that you say you have fuel in the bowl, your problem is either a blocked vacuum passage (most likely) or a serious vacuum leak or your idle mixture screw is screwed in too far...and I will add that if you didn't remove the mixture screw and clean it and the passage and hole well, this could also be the problem. I've seen people clean and "rebuild" a carburetor leaving that idle screw sitting right where it was. The throttle body is iron and it will rust and that passage can be blocked.
At the heart of it, you're not sucking gas through to the idle hole and into the manifold. It is just that simple.
When you take the carburetor apart again, dry it well and then start checking all the vacuum passages to make sure air is passing through them. I'll attach an image that has been circulated and used by lots of people. It shows the Rochester idle circuit (in red). All these passages must be nice and clear. You can use compressed air or you can suck on them while plugging the other end up with a finger. Either way you ought to be able to tell if they're open or not. In the case of the idle screw you can remove the screw and see if the passage into the throat is open or not, and if you see any rust or crud in there, you know you have work to do. Good luck!
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
