Quote "I was hoping I asked a specific enough question without having to go into the often-repeated dissertation of which engine modifications have been done in order to justify our choice of a 2x1 manifold."
Forgive me for bothering you with a question, that had you answered, I could possibly have given a good answer to your first question.
Quote "What carburetors do you recommend that fit the two bolt (3 inch spacing) mounting configuration for a Chevrolet 235?"
Good luck!