I just recently put new springs in my '03 3.8L (Eibach Sportline Springs)
is there anything i need to do now. Do i need to install Camber Plates?
i have MM Caster Camber Plates. do i actually need to install them? and what are the benefits?

also....

3.73 or 4.10 gears?

 

It better in keeping your alignment. If you don't go past 1.5" drop then I wouldn't recommend the CC plates. If you are going more drop then use the CC plates.