Some good advice and some I don't agree with but MOST IMPORTANT thing is do you know how to adjust a pump-shot? I am surprised by the amount of people that have no idea.

If you know this and have done this then my apologizes: With a homemade tool or another person helping engine off have the carb. at full open, now push the pump arm down fully and check with a feeler gauge between pump arm and the bottom of adjustment screw for (Holley says .015) I like .006 clearance. Just make sure you are not over stressing the diaphragm and ripping it. You could have .000 if you want just not past that. I can't tell you how many cars I've seen with stumbles because of this step not being followed. Also everytime you change or reposition a pump cam you have to check and or adjust this.
Ron