I have yet to rebuild my Q-jet, but when my dad rebuilt the carb on our International Scout, he went to Mike's Carburetor Parts for the rebuild kit.
He's located between Seattle and Portland. His kits aren't the cheapest, but the service is unbeatable, and there are videos and demos on the website.
If all you care about is price, NAPA should have the kit you need. First, I suggest you get the numbers off your carb, and look them up on Mike's to identify the kit you need.
Here's the website:
http://www.carburetor-parts.com/