So my tires are cambered in a bit. I have eibach pro kit springs. Would an alignment fix this, or do i need c/c plates and then an alignment?
You definitely need an alignment but they will not be able to get it back into spec without modification of the lower strut mount (just need to oblong the hole). That is what they preferred over caster/camber plates at the alignment shop I went to. They did that and the alignment for $120 and got it spot on with plenty of room for future alignments.
So...it can be done without caster/camber plates but it takes modification of the strut. I believe if they fix the camber you have going on there it is going to max out your stocks ability to align (if they don't modify it) and still not quite be on point.