There's a chance of finding a Rochester B that doesn't leak, but it's also theoretically possible that somewhere out there is Santa Claus, the Easter Bunny, or a unicorn.
The way to fix a leaky Rochester B is to make it a paperweight, and install a Carter carburetor.
Jerry
Jerry - I have seen several Rochester B's that were not leaking...............................................but they were sitting on a shelf!

Jon.