Many times when you R&R the float bowl, the accelerator pump arm requires re-adjusting. You want to remove all the slack in the adjuster arm by adjusting the spring loaded screw/nut assembly that pushes on the accelerator pump lever.
Holley recommends that you have .015" at WOT. I have seen some cams that would not give that much, but you really need to have "some" clearance at WOT or you will eat the pump cams up quickly.
Here's Holley's recommendation on adjusting the pump arm:
http://www.holley.com/HiOctn/TechSer...fo/TI-221.html