another alignment question

I read in a previous post that it's important to set up the ride height before the alignment is done. I have a 63 dart with wilwood disc brakes and 15" tires. My question is, will the ride height be altered because of this and how should I check it? I found a site with the service manual that says

Measure the distance from the lowest point of one adjusting blade to the floor (measurement A) and from the lowest point of the steering knuckle arm, on the same side (measurement B) to the floor (Fig. 2).


http://www.fortunecity.com/silverstone/alfa/45/src2x41.htm

My tires are wearing very hard on the outer edges indicating a tow in issue. Any help on this would be appreciated a bunch. I also have not had it aligned yet, getting two new tires today and dropping it off tomorrow for the alignment. Just wanted to make sure the shop that was recommended knows what they are doing once I get there.