Improving acceleration using 2bbl Carburetor?

My mechanic is pretty good, and he does a lot of work on classics, especially mopars.

There is a slight vacuum leak coming from the exhaust mainfold. The exhaust manifold is slightly pitted/warped. I’m in the market to replace that with a new one and replace all the gaskets and hardware. Once that’s out of the way I can look more a time the carburetor’s performance. In the meantime I’ll check the accelerator pump

He's not good enough for me to pay. Then again, I do my own work.