87 chevy lift question. ..?????

[AntiGov]

Currently as I type this installing a tuff country 3" lift on my sons truck. Everyone says I don't need a steering arm unless 4" or greater. I like to make things correct as possible. I can't seem to find a 3" arm but I do have a 4" arm lying around somewhere I think I can use. Sure it's 1" over correction but I think it's better than 3"" under corrected . Any thoughts ? Also where is a good place to order extended brake lines ? I didn't get these ahead of time cause I was told my local napa carried them, they of course don't . Any info appreciated.