You have all the parts in front of you....... I would think it's pretty obvious what needs to be removed.

I'm not sure how the size and placement of the cnc'd port openings for MW stealths is compared to OE MW heads, but compared to the std ports..... The MW port openings go higher and lower than the std ports.

Edit: after re-reading your post, I guess I'm unclear exactly what you have going on there or what you're trying to do.

You mention the TF270 heads, which are raised runner MW heads..... But then you also talk about the batwings, which are for non-raised runner std port heads.