carbking is named carbking for good reason as he is THE expert on carbs. You should click on the directory link above, search for carbking, then click on the link to his posts. You will find a gigantic wealth of information on the Rochester B. I distinctly recall an excellent detailed description of what the power piston does and how critical it is.
Better yet, you may get to the post I mentioned quicker by searching for power piston and then pick out the carbking posts.
Good luck!
