Thanks Jon.
I also have a non leaking/weeping Roch B on my 49 216. I rebuilt it approx 4 yrs ago and so far it's performed very well.
With that said I tried to setup dual B's on a freshly rebuilt 235 and both weeped and had other problems. And even tho they looked practically identical on the exterior, they differed on the interior, especially in the accelerator pump. I punted on them...
Per Jon and other folks that have extensive knowledge on these carbs that fit these Stovebolt engines, the upper and lower housings can warp, perhaps from mismatched halves or incorrect rebuilding techniques, but once they warp there's practically no easy fix for them.
People have tried doubling up the gaskets and even used a sealer (not recommended) as fragments can clog up passages.
Good luck
