I do all my own suspension work, and yes, for $389 for all the labor and alignment, that's a hella good price. It's not hard, just time consuming. Some tuner shops want like $600 - $800 for all of that. (and most can't do a proper alignment) Then again, I live in Hawaii, so everything is more expensive.
Btw, I have 18" Racing Hart C2's on 235x40x18 tires, and even with a 1.8 drop nothing rubs. (unless I have mass people in the car) If anything you should have your rear fenders rolled. Ask Milt, he got 19" rims on his gen3 with coilovers and only had to roll the rear fenders.