318 4 bbl and intake upgrade

None of us know every avenue of this hobby. You should open your mind, all there is to know you have not obtained, and neither have I. "Any 318" you say, but yes, the 3.91 bore, 3.31 stroke 318 was offered with dual quads.
just what i thought, just because you've never heard of or seen it doesn't mean it never existed.