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You know Metra makes kits for this type of thing. You get a metal piece to reinforce the dash and a textured piece of plastic to cover-up the larger holes in the plastic part where the old tw0-post stereo went. It is a pretty inexpensive kit for our 3rd gen trucks and looks factory after the install. I did it on my '77 when I installed the Pioneer DIN stereo with the iPod and Bluetooth. Gonna update the Crew Cab soon too with a new stereo.
Ask and you shall receive:http://forum.73-87chevytrucks.com/smforum/index.php?topic=27645.0