First, go to the SiliconDust Lineup Server page, www.silicondust.com/support/channels/ , enter your zip code and see if there is a listing for FiOS. If so, it will show you what others in your area are receiving using an HDHomeRun tuner (the tuner automatically reports this). If there's no FiOS listing then try 12054 (Delmar). The listing should be similar to what you have. Note that the only channels guaranteed to remain unencrypted are the broadcast channels and the public/education/government channels. Anything else is gravy and they come and go. In Delmar the HD locals are on channels 71-74 with SD versions on 63.
Next, use whatever apps came with your tuner to see what it can get outside of WMC. WMC adds an extra layer of complexity by refusing to recognize any channel that doesn't give it exactly the information it's expecting. I don't use it so can't help you further but there's a lot of info on the SiliconDust site and probably elsewhere detailing how to get around WMC's shortcomings.