Jeff, nice job in desribing the Q-jet!
I would like to add, for those that are new to the carb or just would like a friendly reminder---not ALL Q-jets are the same. They made some subtle differences in the way the carb came apart. And some of the screws, like the butterfly screws can snap, if you are not careful. Be sure to look on bottom side of plates to see if anyone staked this screws so they wouldn't back out. If they are staked and you try to just unscrew them, they will most likely break leaving you with a WT... feeling.
In addition to what Jeff provided there is a very good manual by Doug Roe on this type carb. All SORTS of good info!!!
Here it is:
http://www.amazon.com/Rochester-Carbure ... 0895863014There are others out there, as well.
Jeff said, he "...used to sell them to racers back in the '80s." They are very good carbs, if you know what you are doing.
We used them to run 327, 350, 400, 377, 383, etc. in the roundy-round cars and they worked great. 750 CFM can provide enough for many size engines, including big blocks.
Many kits you buy at your local Checkers, O'Reillys, etc. have pieces for different ID number carbs in the same kit. So, if you can get a number from a similar carb, chances are, you can make it work. Most components in these kits are the same, but they did make some changes to gaskets. Keep a very good eye out for that, and different gaskets are provided in the kit. Rochester/Carter did make many changes over the life of the carb so very similar carbs are necessary to have a better chance at a kit match.
Like Jeff said, pics would be good. Maybe someone here has a carb like yours and can help with an ID number. Shoot I think I've have or had 5 or 6 Q-jets sittin around here. Now, where did I put those?
Anyway, provide a pic and go from there.
Good luck and have fun.
cheers jer