You have already got some great advise and thought a link to reg. setting or specs might help.
http://www.holley.com/HiOctn/TechSer.../FMFPTech.html
Check the pressure of the pump output for your application. If needle seat are good then must be a high pressure issue. 4 psi street to about 7 psi hot rod is a good to from range but read the link to holley