Andy you have the right idea by starting off with one piece. It depends on what you are looking for, if you like more of a smokey flavor throw in another chunk or two. If you don't like alot of smoke stick with the one chunk and determine how much to use the next time you do a rib roast. IMO, you would be safe w/ 2 or 3 chunks of hickory. The only wood I use is hickory, I use it on beef, chicken, ribs, turkey and even on salmon. I adjust the amount of wood to what I am cooking and how long it will take to cook. Sometimes several big chunks, other times one very small piece.