I just found that the Stanford University Library in California has established a very large photo library related to automobiles.
There are not a large number of images categorized under "AC" but in looking at one collection (Webb Canepa)I found a number of early 1960 images at various California venues (I didn't know there were sports car races at South Lake Tahoe and the Stockton race in the rain is pure pandemonium (including Ace #17)!). The only car I identified was the Pellandrini "Beware 1" for which there is a specific topic on the forum.
https://revslib.stanford.edu/?_=1412728707421&f[marque_ssim][]=AC&page=4
John