I would think that you could test the housing for straightness by using a kit that is used to shorten or build a housing. You know, the kit with the pucks and the bar. You should be able to find that kind of kit locally from someone who shortens rear axle housings. I know a few guys who have them. One guy might loan me one.

Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen! Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!