Woo WHOO!! I now have about 3500 miles clocked on my Nailhead. Approximately, 2500 of these miles are with my EFI.    I LOVE that is still resembles a carb. Simple & clean. With my air cleaner on guys at my local cruise-ins are blown away haha   My carb was 600 cfm’s. This EFI throttle body is 800 cfm’s. I’ve read that our Nailheads LOVE cfm’s & this 800 cfm sure made a difference haha   I purchased the Master Kit which includes the external Holley fuel pump