Holley 3 barrel carb 3916 950 cfm

Pretty rare carb. Used back in the late 60s/early 70s by the so-called 'Supercar' shops like Baldwin Motion, Yenko, Nickey and Dana. Primary application was on 396 and 427 Camaros.
Vacuum-operated single secondary plate that covers the area of the two secondaries of a standard Holley 4-bbl.
There are a couple on eBay right now in the $400 neighborhood.
I mentioned a 3-bbl Holley carb at one of our Inland Mopars Car Club meetings a few years ago when we were talking about vintage speed parts - only us "experienced" guys knew what I was talking about. None of the younger members had any idea what we were talking about. LOL

Check out the new Street Demon for a modern-day 3-bbl carb.

http://www.carcraft.com/techarticle...emon_carburetor_the_new_625_cfm/photo_04.html