I have a question for you guys. My 78 elky has the right mirrors and the z15 rpo code for an SS. But it doesnt have the front air dam or the emblems. Is it an SS or not?

If it has RPO code Z15 then it was originally a Super Sport. See this article for more info on 5th gen Super Sports:

http://www.elcaminocentral.com/modules.php?name=News&file=article&sid=34