Accel pump has three different 'throw' adjustments. Its on the front, drivers side of your carb. Usually depending on your converter/gearing is where you have it. They come stock in the middle, moving the rod more twords the top increases the initial shot, and is short. Middle hole is in the middle. Bottom is a small, long shot. I have a 3500stall and 3.91s, i run mine in the very top shot adj.
Larger metering rods will make your tune leaner. Smaller metering rods richen up. They are probably two step rods. Under cruise/high vacuum the larger part of the rod is through the jet. Hard throttle (low/no vacuum) the thinnest part of the rod is in the jet (more fuel to engine).
As far as the tune, unless you're ready to read plugs, go to the track, dyno, or get a wideband o2 sensor setup (which are awesome), you can't quite say which way to go with your tune that will 'make more power' without knowing where it is now.
The accel pump tweaking can get a little snappier hole shot when setup right.
