I am sure it would be comparable to the 5.7 cam setup I'll be doing in the next couple weeks. Timing gear set ~$175, cam ~$450-500, kit (springs, pushrods, etc.) ~$110. Then there's oil/filter (mine due a change anyway), misc. gaskets, hardware, and any other parts you may want to replace (serpentine belt, water pump, etc.) while everything is apart. I am figuring I'll be into it ~$1000 total in "stuff". I am also going to try the swap without removing the heads, which eliminates some labor time and parts expense on the Hemi. Don't know if you would have to remove the heads on the 4.7 or not. If you're not going to do the install yourself (I am) you can figure (I am guessing) ~$600-1200 in labor, depending on the complexity and time required for your 4.7 engine. If you have to remove the heads for any reason I'd recommend a slight (Hemi guys do .030") milling to slightly increase compression, and maybe even computer numerically controlled (CNC) porting. Porting will set you back in the neighborhood of $2000. For me the gain is not worth the $$$ though.....~25-35 hp.
The cam I am going to use in my Hemi has been around for about 5 years and is well proven in 5.7 LX vehicles to deliver ~50 hp, ~35 ft. lbs. of torque, more MDS "on" time and a little better fuel economy. That, of course, is if you can keep your foot out of it......which I know I can't. I am sure there are numerous similar cams available for the 4.7. Check out some of the major cam manufacurer's web sites.
I would caution anyone that is planning this mod. on any engine to NOT "over cam" your ride, unless you have the other normal performance mods., including a complete high flow intake and exhaust, including headers, and the appropriate aftermarket tuner. A specialized tune may be required for some cams, adding more to the overall cost. Good luck on your search and let's hear what you come up with after more research.