I have never rebuilt one, so I don't know how hard it would be. I imagine it would be relatively complicated though. Maybe you should consider an alternate route. Jegs sells remanufactured Edelbrock Performer carbs for $185.99. Not a bad deal. Their rebuild kits range from $20-$80, depending on which Holley you have. I probably haven't been much help.
Here is the link, in case you're interested.
http://www.jegs.com/cgi-bin/ncommerc...br=76&lastcat=