[GodStang]

I am wanting to get a set of lowering springs. They have ratings and they are from like 450-600 ft/lbs front and 200-300 ft/lbs rear. I understand why the front is higher and what ft/lbs mean but why does the rating cover a large gap? I have a v6 now but will convert to a 351w. What is a good rating to get. I plan to make it a fast car that can handle. Not just in strait line. Also I like the Eibrach. Are they any good? What is the best? Will I need new cambers? Thanks for your help.