I have a shortened dash out of a 65 impala in my 85. Narrowed it 9 1/2 inches and welded it to the factory piece along the windshield and made it all bolt in. If I can find my flash drive or get over to my sisters house where it's store while I work on my burban. I will snap you a few.
Here are some pics of a 57 Chevy dash that I was going to install in my truck, but I decided to go another route so I sold it. The last pic is it installed in the guys truck that I bought it from.