the white car in the Quaid Museum IS a Packard, however if you are referring to the white (light grey actually) car on this page, thats a 1920s vintage Rolls Royce. Mohsin has posted info on it. The car at one time belonged to the Nawab of Bahawalpur and is now in the collection of an enthusiast from Karachi.
Hope you enjoyed the pics. Nice to see younger people displaying an interest in older stuff. There is more to life than NOS Civics and Nissan Skylines!
DO post pictures of any older classics you come across. Everyone in the auto community gains from your input.