Purple shaft cam question

I have a couple of old school small block purple shaft cams and lifters but lost the cards over the many years. I know I can use dial calipers to get close but wasn't there also a way to identify them with the paint marks on the cams?

35912573834_24f603855e_b.jpgPurple shaft cams by John Cadamore, on Flickr


35937596193_be57fc8740_b.jpgPurple shaft cams by John Cadamore, on Flickr