Springs / Rates for Coilover kit

[Whizbang]

i have an 82 FB setup with the GSLSE suspension. Currently i have some adjustable struts and eibach springs, but want to upgrade to the coilover kit you offer.

The only question i have is the spring length and rate. I am assuming that th shorter the spring length the lower the car sits. What is the norm for length? 7 or 8 inch? Then comes the rates, what exactly would you recommend rate wise? I am moving to colorado so the roads are smooth (and fun). The car falls under toy status and generally speaking my tolerances of harshness on the street are pretty high.

I was thinking about the 2.5"x7" in a 425 to 450 rate front (mostly because i plan on running the heavier 13b and possible turbo components in the future) and getting the kit also for the rear and run with a rear 200.

I currently have ST sway bars, stock otherwise. Im figuring camber plates would also be a good upgrade? Would i need them upon install of the above setup?