How And Why Move Emulsion Jets?

I didn't want to muck up @MomsDuster's thread so I thought I'd start a separate one. I've seen other comments regarding moving the emulsion jets and fuel restrictors in the Holley style carburetors. First off, why would someone want to do that? What are the benefits? Also, how is this accomplished? Some pictures would help greatly. Thank you, drive through.
Author: admin