I was playing with pump cams today. Previously I had tried black (min fuel) and then the white (typical cam and a bit more fuel), but it was still lean in cold weather and worked fine in hot weather. So, needed to richen up the shot more. TOday I installed the blue cam in hole #1. Seems to work great so far. The blue cam in #1 gives you most of the shot ealrier on, and also, most of the shot if you just give the pedal a small stab. I'm down to the fractioin of a second delay you have. However if that's all you have now, the blue cam might get rid of even that. Just a thought in case you get a cam kit.
Here's a link to the chart. You need to really look at how much minimum throttle you want to give, then go up the chart vertically to see the total volume of doing this. More hrottle in a light car will not change as much as the engine revs wuickly and airflow will get the mains flowing quickly. Note how the Blue cam has a bigger squirt at a small throttle opening.
http://www.carbdford.com/tech/Holley20PumCams.gif