Are you trying to get a few more ponies out of the mill, or are you just looking for a fresh carb?  If it's the latter, a 350 CFM 2 bbl Holley works just fine.  

Refer to this recent  thread for insight.
http://forums.y-blocksforever.com/Topic103297.aspx



Lawrenceville, GA

I have been reading a lot of the post on this site as well as a couple others sites and from what I have read a 500 CFM carburetor is about the maximum size carburetor you should use on a stock 292 ford Y block motor. However a lot of people have recommended the Edelbrock 1405 which is a 600 CFM and good right out of the box. Help, I am ready to get a new carburetor and need to know what would be best on my cheap budget and stock 292 motor. Thanks