I strongly recommend that you wait to perform an alignment after the car is fully re-assembled, all the normal weight (driver, fuel, spare tire, etc) is on the suspension, and the car has been driven a few miles.
No matter what car I am working on I leave all the suspension pivot bolts loose so the car will settle properly without binding the various bushings. Do the final tightening with the weight on the suspension. If you can do it drive the car a short distance and over a few small bumps to really settle things before you tighten the bolts. And make sure the alignment shop does their work with the appropriate weight on the suspension.
My experience is that just lifting a car off the ground by the frame and setting it back down without driving it will not settle the suspension to its "home" position. Any alignment readings will be misleading. The same problems occur if you have a car strapped down to a trailer and check the alignment just after taking it off the trailer. Over my 30+ years working as crew for sports car racing we learned that we got the most consistent and best results if we did all our alignment checks and adjustments soon after the car came off the track.
Rusty