I have 2 Holley 2156-1 carburetors ford No# C3TE-9510-D should fit 1961-69 534 cu.in. Eng. My question is what are they worth ?

 

one is missing the choke ,i consider it a parts carb .the other is complete ,both are dirty and oily, no rust , and work freely figure someone can use them.

 

These are interesting carbs. I used one a few years ago on my 260 small block after modifications to remove the governor linkage and adapt for car use.

They have power valves in both metering blocks and I think they had the idle circuit on the secondaries.
Mine was a C3TE-9510-C from a 477. The flow rating on that one is only 370 cfm, great for small engines. I removed a bigger Autolite 4100 carb from the 260 to install this SD Holley, and the throttle response and power in the range I used on the street was much better.

The carb is pretty heavy since it has a cast iron base.

I think the two of those would be great on a 2 x 4 intake.

Unfortunately, they don't have much value since most people would have trouble adapting them to use in a car or light duty truck, and most people are in the "bigger is better" frame of mind.

I got mine free from a truck that was being scrapped, and picked up a clean nice looking 1970s version of the same thing for a few bucks at a swap meet a little later.