Coil Overs

[mikes67]

I have a 67 Chevelle (300) that has 402ci in it and i am going to convert the front brakes to disc and thought while i had it torn down i would put some coil overs in,but i am unsure of what is meant by double adjustable and what spring weigt should i get. Is there any body out there that has done a conversion that can give me some advice and a good place to uy them i am on a tight budget.