Poor man's disc brakes are to leave the drums and work with what you have. but if you have the money go for it. Yes the drums separate from the hubs. My memory being fuzzy as it is I can't remember if it's with the center hub or the lugs. I think it's the lugs but just look and you will see the are swaged just in front of the drum face. If so drive them out with a brass drift. If you are considering putting the original 4 piston caliper rotors on those hubs they won't fit.