There really is no reference manual other than Jerry McNeish's Book. If you don't have it I recomend that be one of the first things you buy. http://www.z28camaro.com/publications.html
It will give you the correct finishes on everything.
As far as over spray and etc... you are going to have to carefully clean and see what you find.
There are alot of very good threads over on the yenko.net site showing highly detailed restorations from the Super Car Workshop among others... they are very accurate in their replication of returning cars to how they find them... paint runs and etc on firewalls and sub frames etc.
Speaking of firewalls...I am NOT going to cover up my original P T B stampings. I know I can reproduce them but I plan on protecting them and the trim tag before painting. I may just try to touch up the firewall. But the inner fenders and the radiator support etc. need new paint. I dont want to make it look goofy of course but there will be trial and error.
I have Jerry's book. I got it the first week I had the car. I will plow through the websites and probably bug you too! I am in no hurry so I hope to do it right.