I have a BB exhaust manifod cast #3904399.

I have found it listed in a '67 Chevrolet Parts book as 67 L.H. Pass. 396 427 exc. A.I.R.

Does this mean full size Chevrolet only? Or would it include Chevelle?

My understanding is full size Chev. only, meaning Impala, Caprice, Biscayne. It's not the same shape as the one meant for Chevelle/Camaro, etc.

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Dan Orgill
" It's not the heat, it's the stupidity. "