Let's see:
Lead cops on hour long chase
Car matches description of one used in shooting in the area
Force the cops to use spike strips to stop the car
Make shifty move upon stopping
Yep, justified. I don't care if he had a gun or not, after all that any move he made other than hands up in a clear and unmistakable way gave them permission to shoot. Personally, I think the chase itself gives the cops reason to use whatever force is necessary up to and including using the entire arsenal of the police force. If you're running from a traffic stop you're running from something else too.