Reading a recent thread on carbs and adaptors reminded me that I have an (A) four barrel manifold on my 272 engine. I have an Edlebrock 1405 carb adapted to the manifold with an open spacer/adaptor. Ted mentioned that a 4-hole adaptor would give more engine vacuum so I want to change. Looking at Summit site, I see different  adaptors and I want to get the correct one for my application. To complicate things, I believe there are errors in their descriptions of the manifold and carb bolt spacings. Without me removing my carb and adaptor, can anyone tell me which 4-hole adaptor I need to adapt an Edlebrock 1405 to my "A" manifold? Thanks in advance for you comments.
Gene