This is a photo of a "divorced " crossover from a ram air 3 I think.
The reason I posted it is so that you can see what needs to be cut off your intake.
On your intake, the crossover is actually part of the casting of the whole intake.The view of the one in the picture is the "shared" section of your intake.Take a goos look at it, you will see how it is made. Just cut that part off of your intake, and make a pair of plates as thick as your intake bolt flanges, and stick them over the heat riser ports in the heads, then bolt it all down.
I saw one on E bay a while back a guy had cut, he did a nice job, had plates with it too. The picture would have been a great example to show you, but it has been sold, and I didnt save a pic of it. (wish I had)
Fact is stranger than Fiction