Good question and one asked from time to time here
The OP may not be focused on showing the car just restoring it. Will agree that they are the last detail to focus on after you have all the other fine details addressed.
Sorry been doing paint mark details for four decades and as mentioned there is no universal guide though some have published books and pamphlets suggesting that there are. Way too many moving parts plus tons of hours to assemble such a guide
First place to start for the standardized (if that term can be used) markings would be the cars buildsheet. As mentioned in other threads on the same subject this will help with things line front and rear springs, driveline, sway bar, shocks and a couple of other items.
If you car is painted or together some of the markings can't really be applied and in other areas are more difficult to apply once the car is assembled. Some will require spray or brushed on paint, ink or permanent crayon or wax marker as well as stamps so paint colors and even location is only part of what one would need to reproduce the original marks. Of course many just copy other cars they see in magazines, on a show field or on the internet. Often cars that are different or from even other years and plants
