You can't PC the a-arms with teh bushings, so most people say...
I had a buddy that did and his were fine, others I have heard melted w/e is inside it. If you know a powdercoater that has an IR lamp I think they can cure it that way.
As for the steering stem bearings, I'm not sure if i took mine out when I did my build, I actually don't think I did, hm, oh well.