I am looking for a carb adapter for my small square bore 4 barrel intake to fit one of my holley 450s.  Do any of you know a part number of one or possibly have one for sale?  I have the older thunderbird small 4 barrel intake that I want to put on my 292. 

You can try "Transdapt" also. I bought a couple for my Edelbrock #257. They have lots of carb adapters.

Rono 

  Ron Lane,  Meridian, ID

Speedway in Lincoln, Nebraska probably has just the right thing - check their web site. usually a fair price and near instant delivery....

 
 Steve Metzger       Tucson, Arizona

Jegs has them


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

I do not have the spacer you need.     Carl

I’ve used several of the Speedway adapters for mating later model carbs to early Y dual quad intakes.  The same adapter would work on a single four intake.
  

 
http://www.speedwaymotors.com/Holley-Edelbrock-to-Carter-WCFB-4-Barrel-Carburetor-Adapter-Plate,5551.html

Lorena, Texas (South of Waco)