Joe,
There really isn't anything you can do about the grill; that's the way it was designed. You could swap the grill with a GMC Astro, but it won't say "CHEVROLET" across the grill; or you could replace it with P/E. Sometimes Czech Truck Modell has P/E grills for the Astro & Titan. Again, it won't say "CHEVROLET", but it will look nicer.
http://www.modelmakershop.com/modelmakershop/index.php?cat=c126_Czech-Truck-Modell.html&XTCsid=7oh7ef8glkkbmm39tu07gkoa01