Where can I locate ft & rr coil springs with 2" or 4" lift over stock?

[1972GMCSUB]

Hi there, I'm new to the forum and I just recently bought a 1972 GMC Suburban 2 wheel drive and I'd like to lift it up just a little bit over the stock height. I would like to know if I can go to either 2" or 4" above the stock height without having to change anything like the brake lines or anything at all.

And my second question is, assuming I can go to either 2" or 4" above the stock height without having to change anything, where can I get the coil springs? I found the stock springs at my local auto parts store so I know that I can go the stock route if need be, but I'd first like to see if I can get springs that will lift my Suburban up 4" preferrably above stock.

Thanks for your help,

Chris
dukecac@aol.com