This web site is really for slot car racers as it contains plans to build 1/32 cars, but it has a lot of period information and photos about racing/vintage cars & saloons etc that I think may be of interest to this forum. The 2 links are;
http://vsrnonline.com/Mags/MC/MC_Plans.html
http://vsrnonline.com/SearchIndex_FullSizeCars.html