Try Googling the word storm mixed w/ "Peterson Motors" or "Peterson Pontiac" in quotes as it results in lots o' hits that may be worth digging into including old newspapers etc..
http://cgi.ebay.com/1942-PONTIAC-2-D...-/320687988807
Cool you've hooked up w/ Lee Peterson GM, son/grandson of your Poncho dealership and hopefully they come up w/ something for you!.
http://www.leepetersongm.com/HomePage
<span style="font-style: italic">Lee Peterson Motors ownership is now into it's 4th generation. Lee Peterson's Grandfather, Carl E. Peterson, started out in 1921 as a Buick-Oakland dealer in Cherokee, Iowa. Lee's Father opened a second location in Storm Lake, Iowa in 1939, operating a Pontiac, Oldsmobile, GMC dealership. He later added Cadillac in the early 1950's. Lee's son, Jim, now serves as General Manager in the Yakima, Wa. dealership. The Automobile business is truly a family tradition! Located in the Agri-rich Yakima Valley, the Peterson's have developed a reputation of not just selling the best quality new & used cars at great values, but of taking GREAT CARE of customers with honest, straight-forward dealings and EXCELLENT SERVICE! Come experience the difference through hassle-free Sales & Service performed with integrity.</span>
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~ Pete