Your best bet for that time period would be Hot Rod or Car Craft magazines of that vintage. The easiest way to lay your hands on a physical copy is eBay, they have individuals and lots available.
https://www.hotrod.com/articles/hrdp-1110w-hot-rod-covers-1970s/This link has many magazines that are now consolidated in archives, look at covers until you see one that may have a ‘38 (it won’t be stock in here). Then see if you can find that issue for sale on eBay or similar.
