My intake looks just like a dual plane, except that divider in the center has a square opening at the top.

What is the deal with this type, why did they make it a dual plane if they were gonna open that divider?
will a spacer help me here?
I've been having a little trouble with cold starts. My engine won't just start up and keep running, it takes constant attention on the throttle until it's warm. I thought when I swapped out my 255 @ .050 cam for a 225 @ .050 I would prevent this.