Rochester B carburetors are notorious for leaking out of the top to body seam, or in your case the screws. It’s possible the top may be warped. There are only four screws clamping down the top to the body and over time, possibility from being overtightened, the top warps.
When this happens the power valve does not work correctly causing acceleration issues.
Most will suggest replacing it with a Carter, but there may be other factors. I would first check to see if the gasket or carb surface where the screw is leaking is damaged, then check to see if the top is warped.
One of our own members Jon G, has an Tech Tip on some issues and fixes with these carbs, that is well worth reading. You can view that tip
here.
