have a newbie carb question

Does anyone know of a site where it explains and shows you how to tune a carb? I just got a 73 Z28 and this is my first carbed car. I don't know anything about it. I don't even know for sure if it is a 4 barrel or not. It is a holly and it has 4 bowls so I assume it is a 4 barrel. The car just isn't running right and I would like to play around with the tunning but don't know how to adjust a carb. Any help would be great. Thanks

You'll probably need to rebuild it. The first step is to identify the carb; got a digital camera?

At the front of the air horn will be stamped the list #, e.g. 1850-3. That will tell you exactly which holley you have.

There is a book on Holleys published by HP books. Bought one years ago. Explains them completely from how carbs work, how to rebuild, tune, etc. Very good investment.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=378&item=4555003157&rd=1&ssPageName=WDVW

Go to the Holley and Edelbrock sites. They have some good info for beginners that will help you along. Tuning a carb is more of an art form than reading in a book. You can get some good back ground, enough to get the engine running. But tuning and trouble shooting requires a full knowledge of each working part and why it is there.