Hi, I'm new to the site so be gentle if I make mistakes. I have a 47 Lincoln Continental mild custom with a 331 Cad in it. The fuel pump went south and when I pulled it for a rebuild, I noticed it was a double action pump. Both vacuum ports were left open to the atmosphere, since the Lincoln has electric wipers. Pump is rebuilt, but my question is - should those vacuum ports be left open, or should I thread some brass plugs into them? Any thoughts would be appreciated.