Alignment Problem?

[Dieselholic92]

So I bought a 1981 Chevy K20 Scottsdale a little while ago for 500 bucks. Hadn't run in 2 years, and it needed brakes all around. Well I got it running in about 15 minutes, and I have new calipers, brake pads, and brake lines on the front, but it still needs brakes and lines in the back.

Now that i have the front brakes taken care of, I'm moving on to other issues. The one I have a question on, is the front tires are wearing on the outer edge only. You can kind of see it in the picture below. It does need new shocks yet but I can't see that being a problem. Does it just need to be aligned? I haven't owned a straight axle truck long enough to know what it looks like when they need to be aligned. Or does it need ball joints?