ahh good ole shallow Chevy dashes of the 90s....
You'll need to cut that plastic out in order to make it work, i suggest a dremel, or a small hacksaw blade.
be VERY careful with those wires/hoses. The hoses you see are the vacuum hoses for you a/c controls..
The wiring is the leads ofr the various controls such as passenger door window/power locks, footwell lighting, and more, so you'll need to be VERY careful there too.
in the jimmys and burbs you'll probably not get it 100% flush