I have a un identified bracket I think it is from my 1970 or 1971 Chevy. The number is 3992376. I think it has something to do with a 400 ci small block I had, as it is with the original 4 bl 400 small block intake manifold I have. I had a 71 caprice with a 400 small block that came with a 2 barrel carb. The 1970 chevy pickup had a 400 small block with a 4 bl Q-jet and i installed that. Dale