If there are pictures in those Master Parts Price Lists, buy the one closest to your year.
The Master Parts and Accessories Catalogs that Bill refers to have a lot of pictures. If you want to use a on-line MPaAC, I'd use the
1929-1954 Catalog, which might have more older illustrations.
Better yet, search for
Master Parts Catalog Chev* in Google and on eBay. I found a 29-41 issue on eBay.
The Filling Station sells one for 29-50. 
