My Brake Conversion

[tdub19]

I just purchased 76 disc brakes to put on my new drop spindles. I need to know if you guys think its absolutly necessary to use the dust shield with the brakes. I was going to buy it with the brakes at the junkyard but they were asking kind of a lot and i thought maybe i could do without them. Is there any important purpose they have. Also where is the best place to get brake lines as i need to route all new ones from my new master cylinder to my proportioning vavle and to my brakes. Any suggestions