4wd vans have a place for grease zerks, 2wd vans do not. Any time you replace parts on the front suspension, an alignment should be the final step. I would recommend you replace the bushings now. If you need to put a bunch more miles on it before doing the bushings, then get an alignment now, then again after doing the bushings.
It's a little late now that you've done the ball joints, but if I were doing ball joints and bushings, I would probably just replace the entire a-arms. You can get the entire 2wd upper assemblies for $65 each, and lowers for around $68 (bushings and ball joints included). Tim
Reference:
www.Rockauto.com Moog #RK621261, RK621260, RK641388, & RK641387