I emailed Hughes this same question before buying the Whiplash for my 383. The response I got from them was #5001 lifters and #1106 springs. Not sure about the retainers and keepers. As it's designed to be a drop in cam, I would think they would have let me know if other parts were needed.
I ended up buying this setup to replace the 484 cam in it now, but it hasn't arrived yet.