IMHO, Don (Deweysheads) and Hillsidecycle have given you the best advice. Stick with the chain drive.
There was a time, like from 1999 through 2006, where the only real alternative to the POS stock cam drive was the S&S gear drive. The gear drives were much more precise (valve timing could vary a great deal with the sloppy system Harley used), and had the potential to be much more reliable as well. Fast forward to the new hydraulic tensioner/roller chain cam drive system, and any benefits of the gear drive are greatly diminished. The gear drive requires a very accurate crankshaft, which has been a real problem for H-D since 2007. So you will need to split the cases and either have your crankshaft trued and plugged or welded, or just replace it with something from a good aftermarket source. Not terribly cheap either way. Then you will need to understand that even with a perfect crank, you will most likely have more noise with the gear drives than with the chains. Maybe that's a good thing, if it covers up the other noises common to the 110's and you happen to prefer whining to ticking.
Jerry