I 2nd what Dave has suggested.
Before you decide to use the 216, and if you are going to use the 235 carb (Which I did), make sure the 235 is not 2and 15/16".
I was going to use a two carb offenhauser manifold on my 1961 engine. It was designed for 2 and 15/16, I sold the "Offy" and stayed with the original 235 cast iron intake and exhaust. Glued the gaskets to the head, done away with the "alignment rings", bolted everything back together, started her up, have had no leaks yet.
